Malicious PDF — malware analysis report

Static analysis result for SHA-256 45cf3aed9a78e09c…

MALICIOUS

PDF

74.5 KB Created: 2021-06-30 23:30:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2ca6cd988d7a1fc59ca0c26daf034827 SHA-1: bfe5e213517aef5b35b3bd16bea44a1e60cf88bd SHA-256: 45cf3aed9a78e09c0777cd82eb33b41318ce31d3165751e7c03262f6c75a6859
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to lure users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://medvor.ru/uplcv?utm_term=simply+pho+you
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160818ec28f969---tapomafabenokabubi.pdf
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/3m2eu58kvcbe95gmrogtmj0b0u/58582734998.pdf
    • http://ahkjt.com/upfile/file/38567446462.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8a05b078f---12552528191.pdf
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/0617c7dbdcecce3950e1ea6e33994478/kafedupabuxodifogope.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/baeed3a16ad076b4270111ad263d59b4/11979642990.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebaba595c3---90747264701.pdf
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/8fb53617a43eca84bc8e722d6a772d0b/nevidinuz.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d86da75f2---65515965855.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/h17uefdih0i7svf7rkusl8feie/lobemakonuneni.pdf
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50370468133.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081e0fa084e9---80642572292.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/b7d2cslsg5et3q75h2tdu1mun2/zokibefetowemojasifavex.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a0427498d4d---59382554941.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160838a8573932---71548278131.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16090caf396928---26732042865.pdf
    • http://garderoba.sk/images/_file/62701959340.pdf
    • https://tortugafilms.ca/adminfiles/file/892438237.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/8c429a75f7347723446bab436e06ae59/zovubinulimobev.pdf
    • http://gleneaglehoa.org/images/file/58004296959.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad5de19e83---wilisedebozawoxedimemi.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f9daaaf7d---94041764179.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/fcb1115368a083ae262a64390c5f1c36/70465373934.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/b730p2485blbmaa18agv5e4k5q/49247639228.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c388.bin
cbc03537b0377df053c04e1fc13b96c2bbf89669f3b20b9592a37a781f747f96
pdf-font-stream PDF embedded font (sfnt) at offset 0xC388 10040 bytes
font_01_sfnt_off0000d9cd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CD 16792 bytes
font_02_sfnt_off0000f1df.bin
0639dbeb092607e82143c8dc203f690de8f671cccc6baaea68c7a847bc1bb0d2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DF 16928 bytes