Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d5aacdb38453db6…

MALICIOUS

PDF

114.0 KB Created: 2021-07-07 14:18:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 67bfb7aae87b8457a8ad1f836bfa92b9 SHA-1: d2acac4ea6f3f24237731a447e1cec5e942b590f SHA-256: 2d5aacdb38453db65c8d0c63b847a839812901c192c1bbadb117627e6a4f56dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9664

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://laborke.ru/uplcv?utm_term=refraction+of+light+means PDF link annotation
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/laviruvukul.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/vizawuxifuf.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/fabavabebawujeliv.pdfIn PDF document text
    • http://acril.ru/ufiles/files/giromolu.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/wexalawuraxilibuvob.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/luzopopo.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/cf4e78ab8217ca1244238e92e518ad16/monisezimusizazarumin.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/21263864161.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ceb49ae6d---liborajuturibamemulogipi.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4cdf20abe---nagogap.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac10607088d---sufobariworuj.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c817c1ef9b---23801154421.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd8153bfba---kejunadegulelagapafedupa.pdfIn PDF document text
    • http://sciattella.net/images/file/jifolomavolofiduma.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/24345911269.pdfIn PDF document text
    • http://teaandtiarasottawa.org/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/rewiviwiziko.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/90938988092.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/6057962112.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f51678088b---74428781456.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/bc7202pksb54e3mu50gl9aorf2/95832287860.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/88061711710.pdfIn PDF document text
    • http://toonesk.com/upload/wamalurujofofirinove.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210601_032629.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/1a381f3cc28509669d086d0f965a7558/83370103018.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00015db5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15DB5 18328 bytes
SHA-256: d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60
font_00_sfnt_off00012648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12648 22324 bytes
SHA-256: 378a001a931ac358b26c0a3d91089559b94b0582d7d88bd3de1a908982b03a91
font_02_sfnt_off00017b57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B57 10828 bytes
SHA-256: db9c8c70bd12c127fe374d3c0ebc42d8d28ee8418a1a5fe7745e8b4e86ee7f49
font_03_sfnt_off00019416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19416 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
font_04_sfnt_off0001a195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A195 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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