Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5b025773f1604c2…

MALICIOUS

PDF

83.7 KB Created: 2021-08-23 11:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cf45aa3033f594577154f4ea6dde6ce2 SHA-1: 05d77f90e3d1b430ded2fc02b3b9326e46b276c2 SHA-256: c5b025773f1604c2ee3f7b8f1b9bff0043fdc9a730cc5d6a18b4195f1d1fddf3
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised CMS upload storage and disposable hosting. These links are likely intended to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • 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.
  • 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://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dab58de824b---kexakumomomobizakuja.pdf In PDF document text
    • http://rhodeislandalpha.com/clients/56223/File/senuzugutubadufuj.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/d8f57850b813e58c304cc4dae01d5eb9/refudosiji.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c43ff1574ea---85424479973.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/v943rkd545mo1ai5meairlj5p3/29791533264.pdfIn PDF document text
    • http://canadanur.com/resimler/files/difikepadev.pdfIn PDF document text
    • http://gdaniec.com/upload/files/4447089174.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/c4d018e0400d6d60ae4dd40a795f657c/20265945495.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/43804623913.pdfIn PDF document text
    • http://classtool.info/upload/files/dodusadadepeni.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210531_800264E1CF7D3845.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ee8da1360---newofowamin.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///31666302619.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/32581183982.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/tobisetekaworanufobabixe.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/mufapitomofe.pdfIn PDF document text
    • https://condominiobrisasdelnorte.com/userfiles/file/roneguvodaworigi.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/lilajez.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3226cb0a0---jaxevir.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/molodekibejixenob.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c71d388875---wotule.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/77188047839.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/zidijarodowilolu.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/wumilufapenawifude.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=1st+2nd+3rd+trimesterPDF 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_off0000e56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56F 16896 bytes
SHA-256: 4ee84505cb1e39ec6a69a7a7c6997f7cb07654a12e4f37a22d52f68e808ef826
font_01_sfnt_off0001112b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112B 10328 bytes
SHA-256: 5c3c5b8db11768a9c4acaed47e769817a689da9823b5fd7ac7b1d91d0737d1ec
font_02_sfnt_off00012886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12886 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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