Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c865348b41b509f…

MALICIOUS

PDF

85.9 KB Created: 2021-07-25 02:41:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 64821c0ea39b99b5eef6ee1bc2ee2bd0 SHA-1: 6a9aaec9ef7c99778c104f3378e116751c4e2334 SHA-256: 7c865348b41b509fc0be609508c38e751dda20a2d8486b73d5d750eb85388630
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute traffic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://haiphongcontest.com/images/files/17548700612.pdf In PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/8ec2fd5696c0974bddda5b20cbc52c69/papim.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e26a7836b05---kewudowadumegiravime.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/g13kpv3d1e6uf6h5i6jg698ubq/rodelibofilobatesuw.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/lufuzekagijod.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/76099291162.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/jazokajekekavube.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1395d3cbc---94506035289.pdfIn PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/tepivanenubi.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/49906041950.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/kezelesukuwi.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/nepumajusepepisexiwebop.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d4943819f---36097959335.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bf70278d5---punepomudu.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/dj8epil8u7mg45a83nm3e6t4ra/nevatajota.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/81961867600.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/087a2b1d49934ea70af7779cb5be9722/sexoverufeni.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/c97d50d83b8dfbc4544bc224a573188c/5609818593.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/4f283e7c86769468d14b912dcdd46ae4/94788760352.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/dezevimodibujupudisur.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/c8d786a0d7bfbd1bf9277413b660377e/67733117565.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/dakumibizozanonaguju.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/9358536436.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+draw+a+velocity+vs+time+graphPDF 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_off0000ec4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4E 16724 bytes
SHA-256: 1b87e0d28101626712643727ce1b676f4a6c3a64357cfbe9729a00d93a11deb8
font_01_sfnt_off00011817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11817 11116 bytes
SHA-256: 2ddc57ed1e800444665649f7f30f88a9d2f1125175395c0db50e484259c38421
font_02_sfnt_off000131d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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