Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a6b2c70c1340335…

MALICIOUS

PDF

494.8 KB Created: 2021-07-06 07:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f8664e7d5bdf6ebbf7f15ab69ae9d5e2 SHA-1: b4ecabb5c32c90deb218d926b33b3041959e9d06 SHA-256: 8a6b2c70c1340335a3e874c111b8a9c757dfa24b4a81bf030bd0d1e28f513976
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links, with a high-confidence heuristic identifying a link farm pointing to compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content hosted on compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8342

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crysiq.ru/uplcv?utm_term=purdah+meaning+in+english PDF link annotation
    • http://pnktools-th.org/ckfinder/userfiles/files/56614390067.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a28c164c6f---fiborofuw.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/2cadc68b67b0c63a9ec9c32eb07faa1d/77021305404.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9f9345443---83070380055.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/kojepasikakokarajafevema.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/v2hv270ag86t5jlt4ula5v77cr/59916239853.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/kamujifa.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/rejudawemipezu.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160795e405c838---87894729883.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f8b067a1a---86829759069.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/8415186389.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad993f8f299---74985380713.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/b6rs5s7iqgepjceo0f2ph61kjh/82545314657.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/8f91be11680eedfe623cccba1f752792/47972543346.pdfIn PDF document text
    • https://xigmatek.com/upload/files/mewizotom.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/09555ce84b6ba93d8776264727e69170/51866487450.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/lelotiwibix.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/ou2u9147q6qqaeuidihb4ar0t8/tixibabogalevetikot.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/fugoraduwijerevak.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/364e80fbbfdcb683e4eb450307ee62de/mibiwus.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/ud8eskckc1hq447vurlvnmcol4/90124910133.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/795cb0d3d75c39dffe6948122b9be47b/pagafamu.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/zaserolelivazeg.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/3310602290.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/35519132515.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00074166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74166 10576 bytes
SHA-256: 64b230cc18f1f7c0f060be458217d1deb60797bdb50bf5b6999f3db34dfb393a
font_01_sfnt_off00075901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75901 26144 bytes
SHA-256: 4def0d5fb82955eb68cb3c0386e9748fb64c0b587b06344fa067898de8ba93e5
font_02_sfnt_off00079364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79364 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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