Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c0784c4e72bc701…

MALICIOUS

PDF

91.9 KB Created: 2021-07-04 03:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 65afe1a2b6299256353c5e0d52721ffb SHA-1: e2df8c574e36eb2c696da7cfcf5ec6438c9e3009 SHA-256: 1c0784c4e72bc701994a15769e97f081b280dbca2a370cad5f7d54ed914d8f2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous external URLs, many hosted on compromised CMS upload storage or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic findings and URL analysis point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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://equinox-e.com/upload/files/gajiwakit.pdf In PDF document text
    • https://arerp.kr/data/file///pomigozip.pdfIn PDF document text
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/kozigixulokiwusirap.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/8vsnhl8emvfkag6i5qgvs8tjv2/89219625778.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/pizawapife.pdfIn PDF document text
    • http://portalkucharski.pl/app/webroot/media/files/15987868844.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/ba662479cff1a3340c97b90c873daee4/51677111947.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/5a11d21ec340bdabc3b9742165371019/pezejiw.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/gaxakezekovibivijofinixo.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/46971887090.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/1d135985e8afc133444c5ea7ca0d97f9/76519057556.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/98101747203.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/322cd5e74bf150521955378f561082eb/buxalenerupi.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d79feac01bc---womipopolinipinoj.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091dfcc9bc17---fugatofiveg.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cfcdda1185b---47678732882.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16098f087a3292---rapasulerozoketo.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/16396592802.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160780cd0a3b86---38023111623.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8bc54d0336000a58e59950110d212414/15662995012.pdfIn PDF document text
    • http://patroha.hu/file/80280701858.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4039b35ede---vitetamukogusim.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/4444f4af67517bfa05c0ce5e7d383e3a/33798140399.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/a158795365a2bbfdd9ce0678dcd60d4e/zinuxumelafukerijukaj.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/zuxeniwomonumepiza.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1135462b8428c5f72f175271918ea733/pofumexobesifoso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=dulwich+medical+centrePDF 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_off0000ec27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC27 6404 bytes
SHA-256: 079e01f346e73deab430f07a7c6af60dc9c78ebd40fa231b227d7a344282dbe2
font_01_sfnt_off000101cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DD 18212 bytes
SHA-256: d9cbafed60758650baeed5e8d2054e338cefa4ac4f4108214e6d7acf7e0cc4e5
font_03_sfnt_off000149ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149CE 10536 bytes
SHA-256: 80a5164f7c6a8833f59890ef423349450f7b91c234a2089a0447648d6f25a092