Malicious PDF — malware analysis report

Static analysis result for SHA-256 303ae5251b5884a2…

MALICIOUS

PDF

73.0 KB Created: 2021-09-28 11:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6ae6c390870c6025febbe125f1e4bcde SHA-1: 2cd93e2d102f2d46e80d561d1cd3882aba2e3f0f SHA-256: 303ae5251b5884a2afd36e6baf385d684a202e21202cb689755d4167f47df07d
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of external URI heuristics and link farm indicators reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://cerritos.songhakbbq.com/uploads/files/bodawelaj.pdf In PDF document text
    • https://eco-translation.ca/upload/editor/file/pamitubusid.pdfIn PDF document text
    • http://vizcsap.hu/files/file/lazosarejirelogas.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbe9998582---josebisiwusenikipowula.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/13690425568.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/dedavamutas.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/96989202801.pdfIn PDF document text
    • http://tercovci.cz/files/file/teverotapajizemi.pdfIn PDF document text
    • http://tearose-kitchen.com/sites/default/files/images/imcefile/87842845417.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/97543136251.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/guzesunalojenivopibig.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/e7f333c0a654131e24040cbe11e246ba/kaxorovu.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/wafuz.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/597724907.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/poxogusevurejafejafeboj.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/fowuzabetifoxibixu.pdfIn PDF document text
    • http://soupworld.de/upload/file/62615594686.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/jenavolapagog.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/fapuvava.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/2b2dd601d8de623295f763176225a4ee/lunutuxim.pdfIn PDF document text
    • http://jpsacademy.com/slbdavbatala/userfiles/file/25886870771.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=hotmail+sign+in+accountPDF 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_off0000b459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB459 20136 bytes
SHA-256: dc70a881a7eb21c1830bf47be11cc16c9d80cc13e7b08eba69051b287d6dfa65
font_01_sfnt_off0000e704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE704 10432 bytes
SHA-256: 70fb18c624c46927605c8a0f9e10f8e0d28086e2be5196933130341b09e2647e
font_02_sfnt_off0000fea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1