Malicious PDF — malware analysis report

Static analysis result for SHA-256 75779025a945f9c6…

MALICIOUS

PDF

72.3 KB Created: 2021-09-09 15:20:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 24fe9d4c825e597cbabcc15cc6d0fe29 SHA-1: e4bf5690d3973269f956c53951b175e8b793e427 SHA-256: 75779025a945f9c602d5772e0936e00b7d20af1ad77d7bd685a2ce5e89e6071b
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to various domains, many of which are flagged as link farms on disposable or potentially compromised hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest a phishing or malware distribution scheme. No scripts were extracted, but the structure indicates the PDF's primary function is to redirect users to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://pixomot.ru/uplcv?utm_term=what+is+the+name+of+the+line+at+zero+degrees+latitude PDF link annotation
    • http://intrinhgia.com/admin/webroot/upload/image/files/84349996878.pdfIn PDF document text
    • https://illustrations.noche.fr/images/files/nalafokoxobara.pdfIn PDF document text
    • https://hongdung.vn/ckeditor/images/files/bemoxoxodesajulexevo.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/perituganemu.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/lagipunisezogirokelu.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/88706615533.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/govuwekimupemekova.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/vidoluzepoxexaganifa.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/64753726577.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/lurilevetetajok.pdfIn PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/2371346489.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/75776449199.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/besal.pdfIn PDF document text
    • http://alituncer.net/userfiles/file/ririkugurinevigop.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/42208099662.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/65103877913.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332d9d5d609---zolepabim.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/fa31585ed80f1961dfeb7af1e0c396bb/17456023751.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/36194398165.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210901142143.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/7nhrldajlbutb67betf18bek2v/37580873838.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/bepivuwitirosawolub.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/a444027706e846b9c80a0076be824205/25247720509.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/xikojete.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_off0000b741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB741 16672 bytes
SHA-256: 73b26f74585b65cb2864650a376b0ec6d03fce9b9bafd74bd258e4eed50aa7f5
font_01_sfnt_off0000e231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE231 10952 bytes
SHA-256: 255be31592657240f0f351d0a5e22bd055d47fdb70cf5c2262109fe3b09f7fe3
font_02_sfnt_off0000fb41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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