Malicious PDF — malware analysis report

Static analysis result for SHA-256 85531b78fd281e9a…

MALICIOUS

PDF

87.9 KB Created: 2021-07-13 15:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 1b7cb0bcdd11413b7f97ed249de85522 SHA-1: 86d8089fc31cd21decf7751bcc9fb220a915124e SHA-256: 85531b78fd281e9afa681e7ad94d426e012153e9d4435ee590d5f13b94ff87f9
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a strong likelihood of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://coretry.ru/uplcv?utm_term=physioex+9.1+exercise+8+activity+4 PDF link annotation
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa84e0c3cee---82633774182.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ee7a85015---80800053344.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/bopuzitonodobemobawejo.pdfIn PDF document text
    • http://cloverpark1959.com/clients/51168/File/juberibolokagupetujujif.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d950e3c337---mowelavuxesipedurizur.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/dixuvipajibewe.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/c397b522606d538161dedc029f5b9f9f/45867093422.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/d9af6f6886185b6faa7961c021c23465/61973131451.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/44763949622.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/53af02d1676fddda2ba480623a313616/98881405367.pdfIn PDF document text
    • http://ipceurope.com/assets/file/tipofede.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cf248aecfff---fulot.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/bibujifo.pdfIn PDF document text
    • http://strandedtattoo.com/file/sisogiwivaku.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/3ukkujm6406ttj9bs9so456ddc/mukij.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f736c253fc---43034460626.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/31130151073.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/e037b23da0cdc8829ca1b7fa6c1b9b48/19286482082.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/t772mk2fqb5rsi2c6nt3r1affq/9141941818.pdfIn PDF document text
    • http://heureka-cz.eu/files/78397291707.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/9v1q4p34gd2matg2vk7fic3aie/sefamuw.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/34206758030.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/sukubiv.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_off0000f031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF031 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10843 18196 bytes
SHA-256: 5049e86e7a7ddfecb2c0cbff0626177de261d60038d2c55b102c931b7185ec61
font_02_sfnt_off00013843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13843 11032 bytes
SHA-256: ae20ad15f54e4c651c03dc859f5016ef32b13ea346bc26b173a9d4969b60314d

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