Malicious PDF — malware analysis report

Static analysis result for SHA-256 1039fafca3feca8f…

MALICIOUS

PDF

82.2 KB Created: 2021-06-28 03:35:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: b1f3d133c25c29a12978d4c027aedadb SHA-1: 4c65129870b3125e4dc64a069de810e2df76a333 SHA-256: 1039fafca3feca8f167e0e2c6f27a8e6a9a7c21c996f4819125c9766839f624b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://afgventuregroup.com/cfiles/file/44278788218.pdf In PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/gukag.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609edb859b592---16789478709.pdfIn PDF document text
    • https://actor-conseil.com/files/file/13760937062.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf70686e44---fobisukavenoborufejodi.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/87842351105.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/fepiwiwomekegijumoz.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/cadad157180fb44a14c6da8a40468485/80826461138.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/7a14bhlom4ts3mr5q4vtfo1gu6/21575745399.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/2589969112.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/34388309173.pdfIn PDF document text
    • http://hongdacable.com/d/files/rusofexiwipexotu.pdfIn PDF document text
    • https://xistenze.com/files/files/regufa.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/28916338912.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/eq7vobnqsifnrvc3rflnor0lfo/boguvesabijaputawu.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d33468bd1abdf61c7c834937ef4d72f6/94000176334.pdfIn PDF document text
    • http://brlairport.com/images/file/ropinej.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609089912771b---8766995245.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc9171060e---dexikilametiva.pdfIn PDF document text
    • https://alutat.com/data/file/62011245289.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608789b68d66d---jikigafifuzerimesopupa.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b46c88c4ca2---68563701771.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/87992260710.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160acdd8bb09e5---sitexamuvirif.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/791b31dc9f0fff40b602f2750f1e7342/30724007546.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=design+of+machinery+6th+edition+solution+manual+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC789 16204 bytes
SHA-256: 6e0b4c58e91183af1d6df294575ec51e5f36f362c1535f5c861c9a32d1b848fa
font_01_sfnt_off0000dd53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD53 11452 bytes
SHA-256: 91dc0d62d89b49ef3cbe3bbbc8f080ab601b352ee77d44f31d974fa7230f4226
font_02_sfnt_off0000f80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80A 16328 bytes
SHA-256: dee7a667d43540a7e3ed1fc91cc651a65c714f5f0622040b95093ea599ae6238
font_03_sfnt_off00012273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12273 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1