Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1091dd0eba107c8…

MALICIOUS

PDF

91.7 KB Created: 2021-06-27 15:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: a13e5d368e86bf58cba9e06cbe3be993 SHA-1: 2bfd1afba1284dd215eb8e94ae02afd0dcd28126 SHA-256: c1091dd0eba107c82567de4f3eb2faa5f6867fdd0eef2f53574d68931087e835
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm. It contains numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to lure users to potentially malicious content. The document body is unreadable, but the heuristic firings strongly indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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 http://klpa.net/userData/board/file/lutisatixatuviwunojewezu.pdf In PDF document text
    • http://retroldn.com/userfiles/file/puzurekupojozanupevinu.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/51739643077.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/0qgk2rol26kfghbuuih53d2eeg/jariditasimijijapeguro.pdfIn PDF document text
    • http://93564497.com/userfiles/52667702919.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/wewox.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/bimetejodutejazu.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccdcdbb29d8---bopabibis.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/81145528060b4b3cb46c3b.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160786938bd519---68624604492.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/kopedizalo.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//gulaki.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/sepegepisojizox.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/4f5870d50ca0b19021a39a274a9ab9dc/defedefovenit.pdfIn PDF document text
    • http://arablift.net/userfiles/file/xojovavafev.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/d19f23950d8b323d48930403701f8eaf/26302488423.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/3c14vitruhq2ht4kc1rek8saiv/89762916270.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/97262262455.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/5e008b498d3d1d21ff268a6cb2c67df7/finitojesusex.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/50427913612.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfc194040f---nezizivexinuruzubumatifu.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0217a2f85---milesakovimawaxokega.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/78e7a1908941eda38cdbcfafd6012f1c/karinodiwesegafalolof.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/5456600106.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080031b31366---33261636836.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/zogejeremopizava.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=colin+davies+gynaecologistPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10399 10656 bytes
SHA-256: c43c01a379166d5ef198300c13deac06219ec41f77753956ce915e8c86cca5d3
font_01_sfnt_off00011bfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFA 17316 bytes
SHA-256: b0ecf7d5e5d9332d7ab0fb8a344a255486d2c763b4ba94e39517b96f649267f5
font_02_sfnt_off0001495c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1495C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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