Malicious PDF — malware analysis report

Static analysis result for SHA-256 67bbae3667ecc395…

MALICIOUS

PDF

87.1 KB Created: 2021-07-16 20:35:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ee3fec58849f59f412929e3a27808446 SHA-1: 393d55b7dee15019ef81c75751a94ffc9a51260f SHA-256: 67bbae3667ecc395593a22c496184a0d85c5b2a9793f681ad37d48ce333c69ae
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Several heuristics point to the PDF containing a link farm hosted on compromised CMS upload directories, suggesting a phishing or malware distribution lure. No scripts were extracted, and the document body was unreadable, but the presence of numerous links to potentially malicious sites is a strong indicator of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/veu7odtspq5df8spomlk91hak7/56526038555.pdf In PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/094636cce742d88391847763a886ab8f/83601077657.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c534fbd9e48---80615680212.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/terer.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7bd17a016---66535983311.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/ba9fbc8a807388fc49674885a094a938/fukiwoboji.pdfIn PDF document text
    • http://jhroseclassof77.com/clients/45984/File/84863783725.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/najidikumivup.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/4c79096337c4ef1e3c529ead51f08725/zulezasupevifasetivurux.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/00c8e2d959401acfcf09cd304516e272/gemakeriwidobopovisetiwaj.pdfIn PDF document text
    • http://zzweien.com/d/files/veteledagodepulipono.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/257807biguqk8l7kpl9tjjir81/simulonedovobamirox.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/54o3a94cd98tdsre3hm2qn68rh/selugefeditepejun.pdfIn PDF document text
    • https://angkalaris.com/contents//files/38085333259.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///vobazilafemop.pdfIn PDF document text
    • http://mousike.it/img_ins/files/zekaxelomikixu.pdfIn PDF document text
    • https://soltendance.com/stockages/files/dapanivokuburotowawawi.pdfIn PDF document text
    • http://orsolyajuhasz.com/ckfinder/userfiles/files/jilalezij.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f5db8ceb---5163184078.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ef8a10b6a---vufexamimuzovuravonis.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/3ep0f1lrv8ipmo8v8pe5a9ccdm/tigubom.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/71518719209.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/7cc4d2e6bf3d618e303092f59e978f47/93705131546.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/be2543684ed8fb0e7f9c691c681c5d05/7025135758.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/pexotopibofalivipaja.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/43549266808.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/kuxikagusafutepibeda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=when+an+interviewer+asks+your+weaknessesPDF 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_off0000f30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B21 16736 bytes
SHA-256: 98865da26ed800972f0b33439046c8aabbddd64afc759325e51966bc4f51325f
font_02_sfnt_off00013692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13692 10608 bytes
SHA-256: 265d85e6e5b0100c888203317dc6865f6454d405e59af44d5534f6c8cabc7d19