Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d56bdc208ab7db0…

MALICIOUS

PDF

84.9 KB Created: 2021-07-17 13:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b7e42afe52ab07ad8df1bd9f1bb1219f SHA-1: 894845ff61454c43cd7987282e974829f5449749 SHA-256: 5d56bdc208ab7db0a64d0eaebdc70765ea42d9b504a0637173b2b5f42db12f87
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1105 Ingress Tool Transfer

This PDF document exhibits multiple indicators of malicious activity, including a high ML classification and ClamAV detection as a phishing trojan. The document's structure suggests it is a link farm designed to redirect users to various PDF files hosted on potentially compromised websites, with lures such as 'ccleaner professional license key free'. The presence of a remote-support tool lure is particularly concerning, indicating a potential attempt to gain unauthorized access to the user's system. No scripts were extracted, but the overall pattern suggests a phishing or social engineering attack aimed at tricking users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://baaningdoi.com/file_media/file_image/file/remavamojupajad.pdf In PDF document text
    • http://cityhigh78.com/clients/2/2d/2ddbae4fb74c169819b3574d76e4e264/File/53468641782.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160965aac064ad---11433661535.pdfIn PDF document text
    • http://escqatar.com/uploads/userfiles/file/file/zabimifejusulezid.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705d33ecfe0---21660721268.pdfIn PDF document text
    • http://fruitvita.com/files/files/xixejejijobofi.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/5296365702.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/80491980348.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/2ed7fc28442b8e6183a1655da509d581/xuvamonuzupokobololize.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/d2c423a11d8d954cf9d3dc76b43251ce/nijituparojuvitedarara.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/3210652693.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/kovatonot.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/61154454199.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/sonekejakokuxeret.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/a56387341124fbbcd90307dadb2dc909/1445783742.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/96098746066.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/xibedaxut.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/sosifupuwakebeza.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ceb1543782c---50411005890.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/83866897769.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/cffa7f4282a4b2761d312b355186cf60/4854420308.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608111288ed2e---wotokipanidawogimumafutim.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d87dd874ab---zupivopebareman.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=ccleaner+professional+license+key+freePDF link annotation
    • 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_off0000ea23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA23 10612 bytes
SHA-256: ea4603adf41369dbc378210f34292ba309dc80a277efbbaba50fb6f59ccd3ff8
font_01_sfnt_off0001028b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9D 16852 bytes
SHA-256: ae3c76834fb9943819e19492a873d08c72e1f685d7ba8bcf0119745cfff4d913

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