Malicious PDF — malware analysis report

Static analysis result for SHA-256 e581009ca9b19efa…

MALICIOUS

PDF

93.8 KB Created: 2021-09-01 13:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9973d1461d8badad68eb21e81e948243 SHA-1: 858ac64740049e86146c2821e768a61c19b69c60 SHA-256: e581009ca9b19efa1b6782bfc507b5e8f54517d40b94cc8fd93acf6318adb1e2
156 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. Several extracted URLs point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://cz-synergy.cz/data/file/sawege.pdf In PDF document text
    • http://limobebe.com/userfiles/files/xozuke.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6fbe10aae---vagememotitexob.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/koxadesekogep.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/o88imccaotcle319lukots954l/33685690888.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6fc0d9f08---33379973161.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/tklk1pcfbic4pk6u33520l8fdp/tatubapijigob.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/zugajivebenunorevoju.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160915c490345e---nusewalexufisaribuwuwula.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/mavulivafobawedebegujeb.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/8267b5b22e60a34246493f0e9bc9a5dc/xubetakezexutapovujefaro.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/lanuwomejovifobogij.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/7a1f66275f2d1d11d3e7e4949e25a924/72600906282.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/vuxesa.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/41852372796.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/gikibugukugigazigo.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/pabosupumuzedaluredasabum.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/tiwawiferovo.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/37360464464.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/63116255161.pdfIn PDF document text
    • http://skyline64reunion.com/clients/e/ec/ec378541aa9b73e2b99de5ca5545ec21/File/61649520908.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/22220628034.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/riborufijarikemufivufi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+find+polarity+of+a+moleculePDF 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_off000100d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D6 20364 bytes
SHA-256: 481218825554e676049b5a73ef2df13d63a975698d74615d7cc62094b63ea081
font_01_sfnt_off0001366d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1366D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014e84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E84 10904 bytes
SHA-256: 6e3ad3587324852c1b3ce0b36ff476cc41d9ca447cf8db116f7b984f4c83a2a4

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