Malicious PDF — malware analysis report

Static analysis result for SHA-256 4df00abef61bc6eb…

MALICIOUS

PDF

88.8 KB Created: 2021-09-01 15:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fe7d977c22a97919c8a6070bc3269f88 SHA-1: 3cbf054562785fe03c7644740cf2430b2762f9df SHA-256: 4df00abef61bc6eb5767dd142f89463aa01c2f4b94b164e3a78fdfb642e185af
164 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm. It contains numerous embedded URLs pointing to compromised websites, some of which are hosted on WordPress installations and utilize form plugins for file uploads. The presence of 'utm_term' parameters suggests an attempt to track user engagement with these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://medvor.ru/uplcv?utm_term=the+librarians+5 PDF link annotation
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/2b06e47e4e5c8a792ae8f26b535da856/50687049992.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/48569171880.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/wumiku.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/5475bcb5dcf4d84c52468e00b9f43703/fidarasisenoket.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/31784256211.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/73007018868.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/19151130331.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/71582182648.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/taxirobe.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097061610e32---20916550643.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607633d12685d---nalefupiwefoliparopajigig.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c09d04f0c7---xanufame.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e2d97a20f---43267822099.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/mobitajavukimotof.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/genuzazi.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e1eb09dee---mukutizaxijusinu.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/j3pcdl3g2pblqcr2kr3d63642p/39561134908.pdfIn PDF document text
    • http://www.asslar.de/downloads/57668322418.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/88309050736.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d94fbb26bf1e762436f82786d8b28765/dubenajesugefemowibef.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609eea4c472b8---vexijotegejojitafamimosu.pdfIn PDF document text
    • 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_off0000f460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF460 10224 bytes
SHA-256: b30474aeadc8ef4034f9163795c4ca3828c1fc55759cc8b003c92bf6efbb4213
font_01_sfnt_off00010b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3C 18688 bytes
SHA-256: 37298864562bd1f987f3555d847d34961fb725e6f4975f171ff609eb4bc33faf
font_02_sfnt_off00013bce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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