Malicious PDF — malware analysis report

Static analysis result for SHA-256 4222c6937c3ed942…

MALICIOUS

PDF

83.8 KB Created: 2021-08-14 22:31:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cf3509e4744c2648f352fefe8bcbe2ac SHA-1: 3107544a6b2452ddab8a733981424ea5b6568fa2 SHA-256: 4222c6937c3ed942fa5092ae89330352060f05219e0ac5eed265ff56aea8bcfb
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of multiple distinct hosts and UTM parameters in the URLs reinforces the link farm characteristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/bbae531fac90481dbb373657d691048c/58613453127.pdf In PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/42fd7da0d97a40818fe0333e1ab1f716/82555646100.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/40987634161.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/02bafd033afcd991d2a6e93332fb93fb/basale.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/wanibuturodefoduteromij.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/17320393606.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/puxazabezopo.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/wasikoludadapegini.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/50605447136.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/53594786484.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/82483556c1f7ce7577bd05b843adc004/gadevopeluwemituzasufad.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de1befdfc04---24029217325.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/nesalegudojudutul.pdfIn PDF document text
    • http://abwva.com/uploads/files/vogapexidasafolo.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aadb9f8bc27---55205180007.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/geguno.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/13889976431.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee2c902915---38393214373.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076c8310d327---galigekoworowosabu.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/ravegujixipenoworawedane.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/l6j2seoh9lkjorgef6s1qf5tne/titexazijekowi.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763fed5318d---50110189912.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/5507002908.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988e044eb02---xalexumoserenosofim.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/42221652254.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/53710624029.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=what+does+it+mean+when+your+smoke+alarm+is+flashing+redPDF 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_off0000e417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE417 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC29 16352 bytes
SHA-256: 957cfa1bc573c59d5f67925c2fd3bd90ae2fb3207ddef9b5a5a0c66c64c2c36e
font_02_sfnt_off0001268b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268B 11184 bytes
SHA-256: 050eecec8fbc75fb844176541159ec9db1352b56174cef307d95c209321a7177

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