Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2b729178df7060e…

MALICIOUS

PDF

86.0 KB Created: 2021-07-17 14:42:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 66af167e4564fc7319bbfc3f31299b89 SHA-1: 2605445e2d4852d17c7f76cd37150b1438132568 SHA-256: a2b729178df7060ec5b13cd98ce8642269a69ec5c54b87b0f640c1411e1cc621
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other potentially malicious sites. The presence of these links suggests an attempt to redirect users to malicious content or to manipulate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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.
  • 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.
  • 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://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57b6717f3e---7337262387.pdf In PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5ed690907---nixutijakiwikemodiva.pdfIn PDF document text
    • http://masonlegacy.org/clients/61515/File/zelafeliwosutazo.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/2918bfd3d7b904facddb192c50bfa3b4/35565107374.pdfIn PDF document text
    • http://njf724.com/basefile/janatalnajafcom/files/zojukizapabakofubujexidew.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1622892718.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/rupanudemetetatidotisikoj.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/2effeb0496f473a63519932131ac129e/rupoxag.pdfIn PDF document text
    • https://chemasan.lu/userfiles/files/22064158994.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/70490333850.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/jotenoxizizasivige.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///39060927989.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/gilarapuzexadegamoximire.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/0928acb25d663edd468e4502b6c45a75/kajixadotexe.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/97699287481.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/lomonevakilir.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/17586599847.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160741aa26cfe2---70693237459.pdfIn PDF document text
    • https://motacademy.it/file/45237799153.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/32859314f5c2d774ad74c692a993e01b/39995960317.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b210f55fbb---vexapod.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/vumezejilepidenobed.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/h2bgo3gelof08spuqg2sfb2uf5/getosuginolex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=sal%27s+pizza+couponsPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001056c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056C 17700 bytes
SHA-256: 57482f5404c8fcc3c6ba4929bb4a9257e411a6cb7256540f4ff269be75bf7b51
font_02_sfnt_off000133a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A9 10308 bytes
SHA-256: 573bfa59d7599c12247680df8edbe93d908ee7aec0c17869997198f8225a5145

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