Malicious PDF — malware analysis report

Static analysis result for SHA-256 f07d0021686e2e48…

MALICIOUS

PDF

69.8 KB Created: 2021-10-01 08:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f0c363429e944059b3e06bf280bca765 SHA-1: bd68d846556c2fb5b46d892bb3b86089c2e23306 SHA-256: f07d0021686e2e482bd6686e9866b5e46167640374698d715b6dba2057c887e3
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains a link farm with numerous URLs, many pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the presence of external links and the overall heuristic profile strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://studiomistretta.com/userfiles/files/devugipumaxurejup.pdf In PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/padarerilatikizin.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/julire.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20219161322466860.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614263e5df043---ginoxonuvivulune.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/67401446363.pdfIn PDF document text
    • https://pima-alarms.eu/slicice/file/42923007187.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc612c3592---lidokulajubudesulediwowi.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gipepopoxewewiralagoj.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/6995331151.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/javomamatogagopid.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/85401093385.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/23974434280.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/gefejageboratadad.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109150654175907.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/rarenibigofodiwibetulawu.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/789810231.pdfIn PDF document text
    • https://braus.uz/images/shared/file/79827730325.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2d3f905c82edf34a97d6f0e9050a6709/88924158897.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a402b467ef91b93259d54c0e9d46045a/nuxap.pdfIn PDF document text
    • http://merwepizza.com/upload/file/20280617878.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152a25c9bdae---tixalazinox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=present+perfect+simple+and+continuous+exercises+onlinePDF 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_off0000aea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B2 16132 bytes
SHA-256: 1c9fd1d2a289466953760837d7fffd5330fff5c80cc4ca953c48a665fd125fca
font_02_sfnt_off0000effa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFA 10984 bytes
SHA-256: b1aa238f4440b6fa0b10b4bef8ec38067837cf57459be7538794c3e5e5063b82

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