Malicious PDF — malware analysis report

Static analysis result for SHA-256 373c9dbe500834f2…

MALICIOUS

PDF

79.8 KB Created: 2021-05-06 21:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 518c2df0a57be3c1264c8dc70110ad5d SHA-1: 2c0a5e6496b865569aa421defa76922318462629 SHA-256: 373c9dbe500834f21b0485b487bdacfd3aadae09b4f8a1b94344533a9cc16c5a
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal that the document contains a link farm pointing to compromised WordPress upload storage, suggesting it's part of a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing lure designed to trick users into downloading a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/2a811346bdb60829555903758cdab7a2/rivumajotuposafegeseg.pdf
    • http://brandnewgoods.net/userfiles/file/33425065967.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160842d8165172---31866305148.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3c12945e6---26181877148.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/tmjsev8kb95ce1v3fha3qohvt2/kevipibu.pdf
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/1fa6c6da24bcdeda4d61612a9a9e4649/54206576031.pdf
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/185s6lp9cnauk0vmkuvif80mbv/32611935478.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/93b6427d8ef0dbfa7377dbcdc9eff026/lutitaj.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/ap0fqch98l7s8fvbrdc95prfk8/50430322327.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/n832j7ug21j2o7tbkora8ml7o7/fegafawimopokomivatuf.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607400a8d5ef3---wumor.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729a870777f---60171815791.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/eloglvnmn3tebqppe2t24gr22n/16524257060.pdf
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085be036d2fc---waxor.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/1d659d85c5539e796964b224da9364fb/pidenosebu.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16072785674757---puwapilufaposise.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd1bb98232---76939981551.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=free+charts+and+graphs+templates
    • 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_off0000f725.bin
2412717dbecb9ea1a0b78eaf5ec07f46fd5a67b263a7bc110be4e8236aa67afb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF725 5444 bytes
font_01_sfnt_off0001097f.bin
982a142967b77b6fc7649b19d9a122624f61fec708047e381013e8d3e107d0e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1097F 11588 bytes

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