Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c764771bfb629d…

MALICIOUS

PDF

71.1 KB Created: 2021-09-21 20:00:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a63c464496a5a932a8203e462724cab4 SHA-1: 1d49d098a52116f00775a57a2f61b91d67238647 SHA-256: 42c764771bfb629dbb59549607a4d6199e4aa9ae99da75895e720bb4cc1da099
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm or phishing lure. The presence of external URIs and compromised CMS upload links indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://cructi.ru/uplcv?utm_term=how+to+install+android+apps+in+sd+card PDF link annotation
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/f5e1fd690d915d7b35d5c1d864041d9b/82324912875.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/9651802677.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/83574cd788e286d6511306769ae89172/38100341303.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/09ea41c141b2260f428a1a4dcb4805d4/zimobezef.pdfIn PDF document text
    • https://inks.bg/userfiles/file/xapuluxetitukovowalukosid.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/465b28ab711a958f8da41e0aa8828efa/3840853505.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614416ca24c22---vedab.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/50550462365.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/75208137430.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/48510212302.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/wuropisodama.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/nawipefedalezem.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/90459951437.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614189e99c05f---21908529953.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/sonumiwizakexuz.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/sedozidekujadi.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/n2l8m8gsrgs09qk832injkerde/85724473324.pdfIn PDF document text
    • https://profesa.net/userFilesfile/99298367699.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/zetigutarunev.pdfIn PDF document text
    • https://ancoraeducacion.com/images/vunej.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/70687145654.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/98347016602.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/josaz.pdfIn PDF document text
    • 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_off0000b58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB58E 15884 bytes
SHA-256: 005a6d4af9f241692c5ca98b8f8d72b69f3208895877c7c3a48c83c44fedda09
font_01_sfnt_off0000de90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE90 10452 bytes
SHA-256: 48e35373ed1c7ff5eb0a6f591c73748f251d286e6dc98d145e153fac57cee34d
font_02_sfnt_off0000f66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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