Malicious PDF — malware analysis report

Static analysis result for SHA-256 1caa6e1a107872fc…

MALICIOUS

PDF

87.6 KB Created: 2021-06-26 01:35:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 1aed0f25e237607ef76c9f1593f40c9f SHA-1: 3a8dc01c5b857aae8e164192941250f7faaeadc5 SHA-256: 1caa6e1a107872fc3c014ab6d53cf9fc2c04b08b8a33e718d7fa25add394973a
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting sites, suggesting an attempt to distribute malicious content or conduct phishing. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a likely intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://fonnepal.org/userfiles/file/85929541199.pdf In PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160803278a1877---luratawaso.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084e1c7b5d83---zulekudevesoxavisogapat.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/05om7m3oma7blenrhrp4d5hn11/23404306124.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/455ef89dde4907807bab6f218f6d1b7c/19684196110.pdfIn PDF document text
    • https://eslms.com/userfiles/file/pusitozozowu.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/34585823704.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089aa4aad43d---57800388270.pdfIn PDF document text
    • http://minicabii.com/survey/userfiles/files/tilerug.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/7542920105.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/15898496468.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c9b0d21ab---xaxutew.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/86664976620.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7afd55926ad8e1831b101e8343083a1e/6293608249.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/pifoneketabebetanenipelix.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/vefarome.pdfIn PDF document text
    • http://centralwestwoodclassof1983.com/clients/c/cd/cd4b3c89dd1500142a52f05b9125c350/File/jodibon.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16094bdff20783---labanijinelapinikazatam.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/nituronojafuf.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/46438544681.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0d2d8905d---ziwivetetinukawis.pdfIn PDF document text
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/fe4ec0c5ed5601aaa45b2e3e416c164f/93730466457.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=knowledge+management+in+misPDF 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_off0000f298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF298 10568 bytes
SHA-256: 066e2f6a8c6074e28d2cf8e309058804f7273f18493588cb3576976fcd20739f
font_01_sfnt_off00010a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12299 17800 bytes
SHA-256: f7374a8c61ca4d787133741fc2ae89255791bf81e36bf4906d82ec1b66ce7361

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