Malicious PDF — malware analysis report

Static analysis result for SHA-256 efe4bbe0251d63bf…

MALICIOUS

PDF

81.4 KB Created: 2021-09-05 08:31:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: c3808d554e9a23ed7441bf24fb7a9824 SHA-1: 7c838b788616146918985d9fbfac0766231e631a SHA-256: efe4bbe0251d63bf0926b97e5b6f8c1979ba2c2d085c4975cba568b061434ffc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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 https://pixomot.ru/uplcv?utm_term=merchant+of+venice+pdf+free+download PDF link annotation
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/ac7ne6b8hf7m26vf29lmpc5pkk/38260872787.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/becafdc5b9db46a99a3842c220fce19b/pidalizutigikixi.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d708cc10b---38259758191.pdfIn PDF document text
    • http://diamondsnspurs.com/clients/12200/File/66806230170.pdfIn PDF document text
    • https://auto826.com/uploads/files/betefuzebopumikexa.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/94800701834.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16099c7d10ace2---kutikumibiwedejeg.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c3c6507e1---tufiteridox.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/5619441017.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/th9bfvbp2t550cqh5q4g233h4r/jixujeduxuwidinomaxoli.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/52448595659.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/kepenisiguvo.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/3e4440a78f26c61fb7bb0756efae4c39/28480039802.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/a117cbcc732fac1c7eefe57b77f471e0/84506454588.pdfIn PDF document text
    • http://cuatudongsaigon.net/uploads/files/42006909039.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/41072208208.pdfIn PDF document text
    • https://www.dgaspcsm.ro/ckfinder/userfiles/files/xipinizifo.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/muxojokikirol.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/basoxejozebelonuse.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/910a4btk9tri9u7nuo2ovgnb40/85661229726.pdfIn PDF document text
    • https://derfo.info/resimler/files/xunatosu.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/rajifaxajiforeneputim.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/583f9031a52f08ef33e2e0e1a0ed11e9/37115976873.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/pirizefiwojifaka.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5cab09142b---tokajitedidadaxekesivit.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f074a870218---mepurawanejofimesafaw.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_off0000dba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA6 17044 bytes
SHA-256: aeed6165db50fee3d4a2cca3e061dae5d26af39a1a27e0edd7e713f1f598fc1f
font_01_sfnt_off0001075f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F76 10696 bytes
SHA-256: fb89c672cb4752709ceffc2a61c6f84d8ff6d05b627297c271a4d1b215c28cb3