Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb78be98a12fa22e…

MALICIOUS

PDF

101.4 KB Created: 2021-07-01 16:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2a41183b6dcda12ceb73d75a67b017a4 SHA-1: f1044ba22dc49e04d8a3871fc3b7dd1b6f4d64db SHA-256: bb78be98a12fa22e0434f957af936535408dff08f5d18537b9432a7901c61038
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress installations, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9787

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://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/9591c194e6c73fcdc9759561f5235f2d/komoku.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2570ecb81---wuvofufog.pdf
    • http://jcon-aps.dk/userfiles/file/48760552280.pdf
    • http://yangpupark.com/uploadfile/files/mafulodanaka.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/c9213628d04dfc0d34e657c5e55f017c/ladidu.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/5b2c42eed164fcb1cac24363fc5cfab6/megineleko.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099fa92ecb44---48952167030.pdf
    • https://angkortaxiservice.com/userfiles/file/tezubesomepegovopos.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6ad6790a4b2f2b819e6d7bd0349fb625/13308959404.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0846b661ca---nipej.pdf
    • https://catwalkdogcome.com/editor_upload_image/file/94860665212.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607edcd2d4d67---vunomajitatopexofaganufun.pdf
    • http://zge-led.com/luodan/images/userfiles/file/63674803645.pdf
    • http://radissonhoteltraining.com/userfiles/file/32574647214.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16078650f6e88e---91405770272.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac0a268484---gemijugapifiluwo.pdf
    • https://kindeeyudee.com/ck_files/files/81908168212.pdf
    • http://scamps.biz/userfiles/file/vamuzinorimikigasamuzoti.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/bbefc954a2b91bb2d05334b28cf4ac13/15863169321.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16092fd71831cb---xamepafibutefetowo.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b894f3d681a---6577538196.pdf
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084987927b15---94296590564.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16076057065796---95718491106.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090042de0141---rizudiwutodimepuzilav.pdf
    • https://waelfawzy.com/userfiles/file/
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160768cc7b43e0---75604627851.pdf
    • http://ogbchurch.com/clients/880797/File/29833425864.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1e27b662a---83528168653.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=a+history+of+architecture+on+the+comparative+method+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_off00012450.bin
87dc19ca59da6588ed972d6962328b0fa85f2bd1bf1b52813c1a9df0630cd17f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12450 18300 bytes
font_01_sfnt_off000153fe.bin
c1b95fefbc94d201808bdaedd074942ef30e96384156ba620014ef341f8c26a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x153FE 11100 bytes
font_02_sfnt_off00016dcf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16DCF 16792 bytes

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