Malicious PDF — malware analysis report

Static analysis result for SHA-256 259c97e59668def2…

MALICIOUS

PDF

82.0 KB Created: 2021-08-27 17:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: db91780d0f324e8e7b7a6304dd9c333d SHA-1: 9881a0e77bc2bd8c05ff94a20d98febeb7cbbd99 SHA-256: 259c97e59668def2854df4e566ba0672033fb1d581026c6edcbf7a11cbded68d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm hosted on compromised WordPress sites, suggesting a phishing or malware distribution lure. No scripts were extracted, but the presence of multiple links to potentially compromised domains points to a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160770233c6f6f---vofujolamagisu.pdf In PDF document text
    • http://aarogyamedico.com/userfiles/file/duvoxak.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/e2f67f5b12b550b86b975a28614f4b0a/zukipinevofufejetad.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/julosemavinalapijoluxet.pdfIn PDF document text
    • http://dytac.hk/userfiles/54923244537.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc4bccd489---85035046029.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/g3cjsagq4t46pk9kq1g3rgkmeb/72745715588.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/4qch42f3jt59na6cc91fnbe803/xaneremu.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/5e73b4a4b1bdd8b6d224470a9563ebaa/91369614224.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/19919753995.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161255d493a22b---guwibiposujetapogim.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/babiruk.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210707230247_werf3p.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160e033833db57---2541323993.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/8k6k80u927l8j91ebkfoi5be11/19259734950.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2783e64ca---53977885299.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/48613837026.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/1a56e2862cf568b9b2fe16e7d0f78f32/tisusajowodafabapofoxapul.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/32bd4493fdcb33dd9cd47c4ea40f1d83/39639497878.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/98793437390.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b2059656766---38175951896.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/sokiku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=purple+valentines+day+nailsPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/93046961194.pdfIn PDF document text
    • 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_off0000da3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3E 18248 bytes
SHA-256: 6bb78cfc9792c98d85a1d7af49a1131ff95896f1dae5e2fc7156b2c96c984f91
font_01_sfnt_off000109c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D7 10548 bytes
SHA-256: 765e1966960afcc8af8acf152794602c11e2ebb20524505b1553924e68d72f33

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