Malicious PDF — malware analysis report

Static analysis result for SHA-256 d045e54a94602f6c…

MALICIOUS

PDF

71.0 KB Created: 2021-09-27 14:26:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2aa9430e1bb231bb09070cb5c385cf0f SHA-1: 15ca0b9a05cf863bce5883fb4c2bf617a7955448 SHA-256: d045e54a94602f6cffd733b7e21e0fb9d573725d9e3c5e7fb74368cb3a7cd404
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm and a callback phishing lure, directing users to potentially compromised WordPress sites or other unknown hosts. The document body is heavily obfuscated, preventing a clear understanding of its specific content, but the presence of callback lures and link farms suggests an attempt to trick users into engaging with malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://kubabus.cz/novy-web/upload/file/75547257009.pdf In PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/40085009835.pdfIn PDF document text
    • http://rakuteriyakicanogapark.com/uploads/files/tugaladuxenafoxokeresen.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/temavobi.pdfIn PDF document text
    • http://mrybalko.ru/files/tamawuzegenokuwawez.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/11970213879.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/8aa1721f8ae70315ff16ac0e7fc304ce/sudogepimozigoto.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/45634171436.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161413986764cf---nopateredekabe.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144ce8b1cdd6---56034429587.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/fafomunomesijawogejaxev.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/1004147607.pdfIn PDF document text
    • https://jagominum.com/contents/files/lasofekodum.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/lawidurebulamegas.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16136d57f92227---38595784929.pdfIn PDF document text
    • https://kmedebiyatgunleri.com/ckfinder/userfiles/files/73945288167.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144837574058---69365092464.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614547489a7cb---dexabupufo.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/wewijojawowolutolixisugo.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/18752201505.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/gevasofimememanilori.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/lozesuxelut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+get+my+clash+of+clans+account+from+android+to+iphonePDF 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_off0000b325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB325 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3C 11360 bytes
SHA-256: 0515103aa4d52dcf6933d4ee40ea3867a20daf3edb7da7ce0222cd0b07ee2047
font_02_sfnt_off0000e59e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59E 15956 bytes
SHA-256: d998fac3bba2b5daed2e7e2acb12eb6336d3e79bde579fbeab5f76e81a1b249e

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