Malicious PDF — malware analysis report

Static analysis result for SHA-256 165001b665d8ffe4…

MALICIOUS

PDF

91.8 KB Created: 2021-09-17 00:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9bb99fd0329468819ac06e659d74f465 SHA-1: ea46594dc8a0c0f1d9ceb562bf7e707be0429e87 SHA-256: 165001b665d8ffe4c4a454357d170e9ca66a1f68a9fa84cbe06e4ab610ff2e03
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to domains flagged as disposable hosting or potentially compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. The file's structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://dobrejaja.com/Upload/file/28389432558.pdf In PDF document text
    • http://cheniou.handysociality.com/upload/files/87559970780.pdfIn PDF document text
    • http://rhondachem.com/d/files/24424209121.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/8889994031.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/586tieb162bq1csgfj2dvgldqq/zigojexekofavejum.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/44779255897.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/68693646085.pdfIn PDF document text
    • https://studyhalltracker.com/files/file/nigezifaxove.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/28894835969.pdfIn PDF document text
    • http://domplus.su/userfiles/files/voxabipi.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/verupukikivo.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/xabutetokebivexokatujopo.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/0r4s083l1j40nk27n7lkb6d287/tojobizutonidun.pdfIn PDF document text
    • https://esz.jp/img/editor/files/20209527249.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/68867fa78652f9e221c2f41ea3f49d00/nejifijufutokokomalufikag.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/44876520965.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/selajewidadumal.pdfIn PDF document text
    • https://gdaniec.com/upload/files/ruxozatunu.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/59204125031.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/28357086248.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/83558523847.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/mavitelulimefoluzivewoti.pdfIn PDF document text
    • http://wawa757.com/uploads/files/baruwozisudixi.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/21443294901.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=wish+you+were+here+moviePDF 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_off00010528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10528 10324 bytes
SHA-256: 4a0e48036a5d8f0f77487d34d965f6fb6d9f6eb67f9a40c99c23f4522db92fe7
font_01_sfnt_off00011c87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C87 17368 bytes
SHA-256: 3f97f7ed000f130f9dd62f8d0267bed5e292b57608be1b33acee8a1e5478abaa
font_02_sfnt_off00014998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14998 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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