Malicious PDF — malware analysis report

Static analysis result for SHA-256 a896760140142dd2…

MALICIOUS

PDF

196.9 KB Created: 2021-06-25 21:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 346531fb8bc07c9c2d9fa8e683d7aac9 SHA-1: cb632bfde6b9aad895290d6342ff7cba83727299 SHA-256: a896760140142dd2d58c37d54b626e5d6cf8557607d45e5fecd60bece973dc75
246 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple heuristics indicating it's a phishing lure, specifically mentioning a 'free-download phishing' and a 'remote-support tool lure'. It also points to external URLs hosted on compromised WordPress sites, suggesting a distribution mechanism for malware. The presence of a password-protected archive lure indicates an attempt to bypass gateway scanning, with the document likely providing the password to the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9367

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://archism.ru/uplcv?utm_term=hyper+imo+apk+download PDF link annotation
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608960b7a6af7---botaxug.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/edt7ibnql65chnpd2cnu2jb4d9/sikemogaxuduwipo.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/on6fme4qkvhitl6qllgpj4saqp/88308699789.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/ht13ttdd0t02mujkivottu6rpo/55833525047.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4bea7bc6f---77142124690.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/15390199950.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1aaaa8c7a---wedonimafelodedukizu.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16088aa6ff14d5---37543772513.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/da512bdc06f0058cb26aef0ba189cf6f/pajome.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210530051003.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b07617455f9---57563987435.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/2tbn6idsir68ar4488jonsba7g/44445070902.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/97279566606.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a77698ad5---vakorerawul.pdfIn PDF document text
    • http://bigsvatcharasith.com/userfiles/file/41783393165.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/f21f194ad8f76a7899e4f8e1c7bba1d7/72369267754.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adcbfe024ac---wojimagilomuti.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/23afd2cfab7c51d362e21a7f49e2fc0e/45814500963.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/pu7ov0fvn2hm92a572dlcu4lvi/bumoruxuzejuzulosugix.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/vagogukoxemutofoka.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cfcae667415---wigikezogutonepa.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/42118468815.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/77443444016.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/xevikalibanigefododezite.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00029507.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x29507 21460 bytes
SHA-256: 4f47becaa58a70a192c62cd94649420b16b56a8183ad2efeec770059c4e29726
font_00_sfnt_off000274f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x274F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00028d04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28D04 1692 bytes
SHA-256: 6df00093d1a1fd8b8f95901b42ba2863538c90606311dd4adf1993a433792d13
font_03_sfnt_off0002b9c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B9C1 19676 bytes
SHA-256: 713d4589ecf14938916632fa0b03acc8640bc23cf64d1dab08d90845a26c7359
font_04_sfnt_off0002ed06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2ED06 10572 bytes
SHA-256: 9f0c0de88ee1511d5a2af6a226953a0a7898b2968d60f09c566d48e3365aa125

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