Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f7e4c892b14abaf…

MALICIOUS

PDF

87.5 KB Created: 2021-09-07 06:17:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bf5871052b7b71f39cd5ee421f51d21a SHA-1: 9df3d51fc39e82a8c3ec16533a57b04095473d8b SHA-256: 6f7e4c892b14abafc4fcf876604b99cad6d3ff86e63adf02ef13b597b10da50e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting domains. These links likely serve to redirect users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://malabarmail.com/ckfinder/userfiles/files/55042692468.pdf In PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca037728547---bavawariwuxipevixaduz.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/57625935098.pdfIn PDF document text
    • https://zhansq.cn/upload/file/mezen.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/liwesomowutelatupebede.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/95330859290.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202107122308441056.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/8d360d8bb6da2669ea1f50e2dfd88024/rebezokire.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160ba6a44cb9f9---lawasekimiwazepakogewu.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/9d0c39cd3ac7bd039b6312d016c37bf6/siliwumolevujuzesune.pdfIn PDF document text
    • http://apcmagon.com/userfiles/nudulafune.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a8cd531f5---33778380400.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///70701325752.pdfIn PDF document text
    • https://tekartltd.com/upload/files/bimoremivigeva.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/silometixifavotudadima.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/184f4973891ec31cc9b4de3284b649dc/53466275507.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/10ab127854ce20d7e2002afc5e97b5a9/durususarozevidagineron.pdfIn PDF document text
    • http://artospace.com/pics/file/74049249048.pdfIn PDF document text
    • http://hotstamping.pl/files/file/23527606813.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161273b0686b60---dawikopevikedemuze.pdfIn PDF document text
    • http://indel.sk/userfiles/file/temalamasulijer.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/84324309494.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/06e4bec90c3cb88a4706b2d5607f6353/12027951774.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/64023272451.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/sesadupitukidawofawiju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=network+troubleshooting+tools+help+for+network+administrators+pdfPDF 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_off0000ee29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10640 11340 bytes
SHA-256: 31d76b68c2713d17ad018797184c1cb1168d8a69860add6f1d1feb9acc1a5e58
font_02_sfnt_off0001205f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205F 17364 bytes
SHA-256: 03bbd3017fcfeddb5f0d64f4372b40cb26b2ede4106659bf3d996bba4b5f5934

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