Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b79ae3423d54243…

MALICIOUS

PDF

76.5 KB Created: 2021-06-17 11:04:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 9880db6c3a74d4fef53ebf04cb9feb17 SHA-1: f2376d50fcffb09ef9a7f42eaff676d60c1c213a SHA-256: 7b79ae3423d542434bfca11b3c15ece83be0664463f0185edeb8e533a458f5ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9998

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://laborke.ru/uplcv?utm_term=dollar+bill+origami+christmas PDF link annotation
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e038f107f3---jidopegilekalu.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/an8stju54i5msm9aphkbgf5cbg/75492356737.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608405d86ee05---lapujo.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/foluwogatuvamipagiweb.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/nadobowibedipox.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b256ef057---65551453921.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092950310f7f---6088188574.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/85673414066.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5e11046e2---2689049269.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16077d5b6e82c5---neponikimokujevefok.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/83257168113.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/parumegosebotukitugexaju.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/ce3e68db85de9ed3a7bbef3514fea5c5/favosanav.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7e7c270e6---womijofodexoma.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/5ee354fefd33e7b6eb259f4bd6db917d/wufuwusavipugiwodu.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/70prfmdisa3skg8iv2dtknhkrr/mumutebazezot.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/32cfkmq7fnf85oggdpjamc9uc7/tizev.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/sexizitalisomit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE427 5352 bytes
SHA-256: abfb41368e9fe2e4ae042edb6a0c74a24ba59f5eb260e8371ec864fe8120d22d
font_01_sfnt_off0000f634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF634 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off0000fec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC2 10960 bytes
SHA-256: 2b9ca3dfa770bb86d9db28bf65788b597cf3d6c9f67ef881569009324b0a4b5b