Malicious PDF — malware analysis report

Static analysis result for SHA-256 008caaf4d4096b38…

MALICIOUS

PDF

80.3 KB Created: 2021-09-16 17:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e2c3a769b5912043cc3485733ad5bbde SHA-1: 3a9ac05010cc20d97ff6921cf91fe6ed4050b791 SHA-256: 008caaf4d4096b38bca48dc68788d985d664bc73c9e026b5807dfcae36c2b177
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers strongly flagged it as malicious. The presence of embedded URLs and the nature of the heuristics suggest this PDF is part of a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://philabc.ru/uplcv?utm_term=short+5+line+stories PDF link annotation
    • http://61kidsclub.com/userfiles/file/bowudipal.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/94539426840.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/71567882087.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/dimelumoxivokesel.pdfIn PDF document text
    • http://jawarakreasi.com/file/mebapalodubasugunuxus.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210903180525.pdfIn PDF document text
    • http://valeneighbors.com/userimages/purigasi.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/90499154342.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///67707102568.pdfIn PDF document text
    • http://thietbiantoanttk.com/uploads/files/94277943507.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/4012655871.pdfIn PDF document text
    • http://thephinhmienbac.com/upload/files/15435390122.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/74109000743.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404b48189b8---vonuxumunafut.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/duvozadexanu.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/36798759417.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/31905073811.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/kozavovima.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/55388147976.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec59011f9c---mukozutigiko.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/88751978097.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f89e119c99---2481015976.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/44703342267.pdfIn PDF document text
    • http://cutskytools.com/d/files/3175067441.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_off0000d9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f20d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20D 16512 bytes
SHA-256: ae2ff2658347ca81ab23b79c1046c8e331981603f059a3f6a6bd78cad5647b1a
font_02_sfnt_off00011c8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8E 10252 bytes
SHA-256: f194da18453c56e886a6d91c2fd1dddf76f059bf518369705cedee2c737a4710