Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e3a8e8511a8940e…

MALICIOUS

PDF

90.9 KB Created: 2021-07-18 05:55:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: dd789cc153e891311cce967035aa33d5 SHA-1: 11cf1ffb81ebbf1635b24dabd19f776328d33107 SHA-256: 2e3a8e8511a8940e62c212840c96355594be9d7a1d16034a6b963f426b6d323c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It functions as a link farm, directing users to compromised WordPress upload directories and other disposable hosting sites. The embedded URLs likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160915f4467d72---72871255234.pdf In PDF document text
    • https://landbondcorten.com/attachment/file/dbe0ac556a4edd6517c666a9df264e35.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a844526a965---zuxas.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/judemewurubof.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/5cb5f5f5b72c7a3508c2978eafb0b661/37770828977.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/2dihm94bsbrq7873isaih7mq87/56500560497.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a47192439ee---82197120312.pdfIn PDF document text
    • https://led7.ru/file/bugimeguritefijupipol.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cecddd797e8---tuwogutamolajovubevus.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202107180258237680.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/rfa9qah6ncoh3qc0bd0rqllhh9/wuvurowuli.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/zasojuxazuleboneres.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b3836dbf419---defoxifoxomimi.pdfIn PDF document text
    • http://doer-sh.com/Uploadfiles/files/13154217212.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f80987fbf---juzefanurawugokevoviza.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160bb73f7f29d0---66343148014.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/91806553c2da9cb1f58648910f72b7d2/purubafage.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b675ae82cc3---balokenimilurum.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a87b80959f---45541631283.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2fcacd92e4---2134156722.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/wabozukoxosokobokuge.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/f1fa689f94b33d76d15dfd6b2d5db01c/35987971496.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/divururesaxobisogima.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/7160aaea2850a38447620fde5b01eb42/jifinagusukaluvubipodo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=the+definition+of+exaggeratePDF 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_off0000ff53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF53 17604 bytes
SHA-256: 8418741d4bc91c0490daff912f327c6a11b5b5b62fcfd7997c20ef4a20b4d6b4
font_01_sfnt_off00012d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001451d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1451D 10484 bytes
SHA-256: af48d91c4c13f046425aebf04206db797947cd8fd1d5b3856f7e46498c7325e5