Malicious PDF — malware analysis report

Static analysis result for SHA-256 79e658c4c1183297…

MALICIOUS

PDF

73.1 KB Created: 2021-07-07 01:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 61d2db1eba8e4749a19438e218e8ca50 SHA-1: 77048d9fda6d41e9d5529b9e7d66b4e2484a5572 SHA-256: 79e658c4c1183297aae55895094c275cff022934d4cfe4bafe6ef2a3f86316a5
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://smsenerji.com/resimler/files/18646698910.pdf In PDF document text
    • http://ac-kenigsberg.ru/files/file/jakevojijosazavak.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/rexakugagitutowelutopit.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae01670f00d---mifisixividunika.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/9ol7aeun9srhjhrqftg7su7dc7/tunovovinujowogobezul.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/vuluzabesi.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e1f9a99dd---81827261726.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/45092272747.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/82738540973.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/9971d8b9a2f202ef38f7549235a14576/67129443672.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/jtmaenl59qi7838dk1srs66b0q/bowojumanenenajo.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/13555619403.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b156a0855c---nevuxopotawubidusixipo.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/23300e3e9732471f3223e4b01e6101f0/borigikodaxemu.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/40uh83j7mfk75aamgha7shlgu2/koxupisufavike.pdfIn PDF document text
    • http://wenxuezj.com/images/File/kufijukukubuduwirabodiz.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/cu5ob2q2djt839mhl0ese57eoc/jemopanijerijek.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/9183463960.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/13285608074.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/gejekofimawavokaxituviw.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607835ee4974a---95914974584.pdfIn PDF document text
    • https://smilepaper.tw/archive/upload/files/xefalijodoje.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/78608041071.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4b4d2f2c6c3f79d3b9ae2fc1f2998e5b/70689610740.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=potter+puppet+pals+apparatePDF 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_off0000baff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAFF 18012 bytes
SHA-256: 247c0955c87274b03e13010b6ce413c1f848264f72590f33f2b053bbbd1f8d62
font_01_sfnt_off0000e853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE853 10152 bytes
SHA-256: c7417eb1e4d2c968392037104f44e6b28cec406b6d317d5f2ac9141aa237c308
font_02_sfnt_off0000ff3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1