Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4dc9fe84f30ccf5…

MALICIOUS

PDF

95.6 KB Created: 2021-07-10 13:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 8a256460307722c77b1e57d677d75691 SHA-1: 71cdc7705dad7aec58d6a367ecaed27596b58435 SHA-256: c4dc9fe84f30ccf5f22bf6950a0a814504060a4efa21737f824e6bbe0812eab7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jarauwerdaenzn.nl/userfiles/file/17168263126.pdf In PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/36380714853.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/paziwirupusibumipobo.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/d6f44d8f55cb72a82d5e09a095f264ff/56234654130.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce6aaa07ca---gakowuw.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/115e59df06e1e32583f69d16433299a2/worarumod.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607481b45d125---57699877125.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/94719200361.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/25740434097.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/bb51155e2fe01a6ff13364188bb0f678/58445170015.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073766384ec0---paberononadokizoluzexog.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/fituxozijovigajulizinunol.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16075b35e6b064---rugelubanesofitag.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/1eearp65h23nvqm5k2t8ilkj1c/78027627350.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/pepibemobolutivalibo.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/94595120532.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5b0201663---81985464255.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdeaf22ced---sixagebadiziragiwo.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/junogabaki.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f9d3fcf6f5de4ad3ce5be9ae54406bec/gozuzibofosulumevozibode.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/ea243d84074d4f1119cf1e3ba88f9f12/nuwomirirowavisagekezape.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/gthaqjj8pfc15r58se3qj3c0du/52586654008.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/5962719f949330bed6ed198f319029c4/45684947259.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=sexiest+woman+2020PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10834 10628 bytes
SHA-256: 42bf9821164e9db214d4684ec0bed5b70f065bfaa40dd8c92282473b9dee5dfe
font_01_sfnt_off000120a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B8 18492 bytes
SHA-256: fd10316d353217c9d42146d7f5a6394bf512a6b709eb05c25c4095b83015d40a
font_03_sfnt_off00016850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16850 1800 bytes
SHA-256: 83ef702c077bafc675a6059ae4b8425715619914591e137d15df02cc1c0ee1b0

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