Malicious PDF — malware analysis report

Static analysis result for SHA-256 71bb3cdbc7426fda…

MALICIOUS

PDF

84.7 KB Created: 2021-09-06 00:30:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 92a6f16f9843e58c2cda305131b4772b SHA-1: 9eddfeb2d88a827ba71543c7bc15f0def4d7ad33 SHA-256: 71bb3cdbc7426fda8ad0b709f5aad57056f64911271692b8551a232969fa567c
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The presence of compromised CMS upload links further supports the malicious nature of the hosted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://serdceprirody.ru/userfiles/file/garukogowekuduzegesaxuve.pdf In PDF document text
    • http://webhenevents.com/clients/868374/File/gesoximixeb.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/29495800229.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/bumobofejabutisabek.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16079c0c12a2c0---84744757759.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/purekuxefibirikofawoda.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb4e26441b---76665977603.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/0088def0b8395e9d6b102dab0f7460d1/64600833566.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/690bea93a3926c5469c38c6ffe0aaa24/26399554857.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/9cc2a555d6cb5f0bbcbba97df5219767/jusadevuxegelezomevajo.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/57616405989.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/e6f500f7204648762d181d235e247acd/nexerujajutotobefufeju.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/54374140223.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/99413548367.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d384c53b08---mabiziropasebopoxuwuxu.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/20f4c2ac8a0994785bc05c899dc14435/12584591463.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/15024818557.pdfIn PDF document text
    • http://homeopathyhk.com/files/zofuruvalo.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/92609901475.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/nepegudugawiketowazito.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/31583708442.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/79e2d740a58a89d9ca61dd3920c2c90e/29050161220.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=applied+biogeography+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_off0000ddcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCC 21592 bytes
SHA-256: c8e6f4c69fe2ffc77a0d96e0809b8d47587fe617b215d18dce96a8049ff790e5
font_01_sfnt_off000115ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CA 10644 bytes
SHA-256: eebdc954c793f2e5eb89d79188428c47d49680cfe9edef9a687757a5f444c02c
font_02_sfnt_off00012dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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