Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a4a39206c923fe9…

MALICIOUS

PDF

84.9 KB Created: 2021-09-13 19:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2b451bf10141c9003ca86cf9576117d7 SHA-1: 48d672bf5b3f59d83e0bae2e9e850f849479958a SHA-256: 6a4a39206c923fe99b72d742b9719ffbf20f0bda87a2bc0d6093bed7329a4d80
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1027 Obfuscated Files or Information T1553.005 Security Software Tampering

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious files. Crucially, it includes instructions to disable security software and provides a password for an archive, indicating a multi-stage attack designed to bypass defenses and deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://institut-arabe.org/ckfinder/userfiles/files/fuvujulinava.pdf In PDF document text
    • http://designbeginnings.com/upload/file/90748474251.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210913071010.pdfIn PDF document text
    • http://saint-party.com/media/file/senonokej.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/bagokowomosinulug.pdfIn PDF document text
    • https://agermag.ro/mm/file/93880068687.pdfIn PDF document text
    • http://itexpertdog.nwoasis.com/upload/files/ganokade.pdfIn PDF document text
    • http://erictex.com/ufiles/files/48517660693.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336efe3c5d9---podapovukuru.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/wujarafipukesafizipas.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/nozikirepirijomejoge.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/rekurivifasa.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/bawevunusozegetezivat.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa97873d33---mipamafurojidekaze.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb310be520---3493067423.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/ninotasivi.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/vebedovurejewoneviwinesid.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/58208890556.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210906060845.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/mitoj.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/manabokezegemiwusefumadi.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/zezuwopumozomezunopezo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=download+gta+games+for+android+highly+compressedPDF 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_off0000e284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE284 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9B 11268 bytes
SHA-256: dac532f4959ad0c45705794511d22496b8a3f99b47164d649ac061cdcf36ffae
font_02_sfnt_off000114b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B7 18904 bytes
SHA-256: 1b6b20c4dcf71d766b21f88c58192eba79f265e270d86fc4240c588cef224d55

Open this report in the interactive analyzer, or submit your own file for analysis.