Malicious PDF — malware analysis report

Static analysis result for SHA-256 d74d4e037ab8eb80…

MALICIOUS

PDF

62.7 KB Created: 2021-06-20 09:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d482efa843a36ad22e9b36f2c2eaf8e2 SHA-1: 68691175bdfd0b3371ce11770d412cd68acd1857 SHA-256: d74d4e037ab8eb806cc5563d65df19644cc3bf065b161bc86f77e8906412e40d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm strategy. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of external URI heuristics and link farm indicators supports this assessment.

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 http://bearings-home.com/userfiles/file/jiluzuwasakojanuwez.pdf
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/xulonigu.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/tqgqmst88drkum2qe76srrj31c/19608906969.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/7lp4haegkr6rch0mfe2qjm02s6/72155652572.pdf
    • http://fdscience.com/UPFILE/userfiles/files/27717442817.pdf
    • http://famillespourstarlight.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/jarodulodilogolonebajemet.pdf
    • http://agroanaliz.by/upload/editor/files/722963340.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/4424a3bcb774545ad110119ac3c60bc8/luniximuwogug.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/8g0hld6hf695odkejilh2mp6no/taninazaxikunalivodegikul.pdf
    • http://zabradli-znerezu.cz/userfiles/file/23421564521.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bddbe24f12b---35197505416.pdf
    • https://textolinguisticsolutions.com/upload/editor/file/97288696720.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/l55icldk0h264lvienusiv781i/pedimititenenig.pdf
    • http://williamshudson.org/clients/3/35/35bf74ce48b5c120232fd40fb4fe3e45/File/35848153267.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2665568b0---53977583196.pdf
    • http://efuegypt.org/userfiles/file/gezuredazaxovuwava.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079972c731fc---wexoresexala.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/tsjbo504q5t061tkvrpp6b96qb/pemubotenikujaxawum.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094754f50c01---31065702909.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=barron%2527s+sat+vocabulary+flashcards+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6de.bin
3424c73edf0410a23532ab80a64e6101e913413bb80d6ff4dfaddc7741a888a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB6DE 5628 bytes
font_01_sfnt_off0000ca0c.bin
de7c0c625b64f4a4b91a234961b422811d030cb0844308ddc36b1c01506febec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0C 10080 bytes

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