Malicious PDF — malware analysis report

Static analysis result for SHA-256 94fe16d308ea5075…

MALICIOUS

PDF

74.2 KB Created: 2021-05-19 12:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 630a7bf33dc67fb4ac76d60bba5e5554 SHA-1: 51d1cb82bca3d50f1e2439ef9a1af574f2f7c60a SHA-256: 94fe16d308ea5075dcf0bacde26f364952b1ac2facbf127cc449215f4afbeacb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains references to 'Probationary period review template uk', a common lure for phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nomylo.ru/uplcv?utm_term=probationary+period+review+template+uk
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/2in1etls1g14maplppre8q6l14/patalalesokejirebiwegunar.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd348d5dfa---notobunagadajej.pdf
    • https://akapacha.com/userfiles/file/zorapi.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd2eadb32c---lunob.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609561a9b1240---dolezatowipogiserob.pdf
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795f22b8550---nuxixilaminuze.pdf
    • http://cdmatik.com/uploads/file/73937325283.pdf
    • https://afayl.com/userfiles/file/31901455139.pdf
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/cd9705068af4bd5429d3bfa7ef2d202d/jupufozasavisuv.pdf
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe96fc7cd0---fevex.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f5c5c826a---jupewoxuwoxosigatorudo.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/dso13h0v74m1kbmbibc803n3u4/26116600911.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/7dd5fff6b77be286afd56db8809992e9/lobozuritase.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/rqj4k8e6kde0mn91mdlg6lc9q2/vajisok.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/d6735e6838b83e7d59dda15719f832f6/43870290402.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da20.bin
caa3951444aa667f8dafe7a3014bb94275c9fab63b61dd12218a77a5d6246605
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA20 5268 bytes
font_01_sfnt_off0000ebf6.bin
30581de43928f8446005007151aa1bfe068dfa931fad29fe455a888204967aeb
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF6 9908 bytes
font_02_sfnt_off00010dc1.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC1 4324 bytes