Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dcf2e1b558ca735…

MALICIOUS

PDF

94.0 KB Created: 2021-07-07 05:06:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0f0a3dc4f849f0015ce79d001a7b4b4d SHA-1: 079004eb0581cc50b458328d1435803e75f45910 SHA-256: 7dcf2e1b558ca735fceeb58118b1fc8231c0b8a1521aecf923c1cd969d756d97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or redirection scheme, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a70b436e826---mefawurekaxagejazemop.pdf In PDF document text
    • https://vsetinrally.cz/userfiles/file/mokagoketaw.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160969c46abad5---dumuxuxitexaxifutuz.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/1ef2e2fbc30cb23298ecaa5a31c2df16/7431625051.pdfIn PDF document text
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/ec6cc67b53c2e24a0e1e9e48b125588f/jiziwevalufujix.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/28759100331.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/48699418769.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/736f22d379c1e6556e5be05fe1a66582/mikibibipi.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/7e7b8472081f4fd1f952377e1bac4a5a/76472201677.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c61c89e89e1---panax.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/45773325675.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16072e867b42a2---kegawudux.pdfIn PDF document text
    • https://primer-spb.ru/files/files/71904995213.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/044b1b0b970da809c0cc012539b95ab8/buzijavagetukemutibezire.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160999fde954b4---69909317740.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/vakakegonujipagel.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f94b3afaf3---dumupisapipojakuxag.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/dokagefobomur.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/36438c2252245775edfe31de100bd69d/70423171893.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/e5a5e2d80cec08bd044f09101ecf46c8/35606439821.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/14lrvqc779pl3ovp3etg93lg6s/6094233172.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/xedagudosizexaxagef.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b56dd2976e4---nijexamiroluku.pdfIn PDF document text
    • http://thallo-food.hu/uploads/ckfinder/userfiles/files/5357383684.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/gululipawufaminimuro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=career+guidance+after+10th+pdfPDF 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_off00010bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000123ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123ED 17108 bytes
SHA-256: c25ee0b689377c55451617eb26dc9aca41e15b3ec8b2a041f01a2940a47f6034
font_02_sfnt_off00015073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15073 10872 bytes
SHA-256: b4bd56e8696de283291084bcd9a80c10fc14779b01821f349a45a00c71974272