Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bb1db3829294a41…

MALICIOUS

PDF

84.4 KB Created: 2021-07-09 10:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0055706a60a4073eeebbf590b8345915 SHA-1: 8a2c8c80ac8206ba591f67c8bcfac7909af3c732 SHA-256: 5bb1db3829294a412713079cbb476cea0432ec4e4389741d02ba42ad09d3bd1d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, many of which are compromised WordPress sites or disposable domains. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://pspectr.ru/userfiles/file/finojufi.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/6b0c865ea7cecbdd147b3c595b281461/fuseribexowudumebetuzevis.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/sqdagcjdgnqsdia7ftns5ji4a2/wavuxaxutidofinumig.pdf
    • http://mooneyes.pl/userfiles/file/newobitelogisajimamob.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/4ad31e62bf508e87ebcf96807b2dfb96/35643956116.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160e22930eea48---43740118062.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b553d4d7d2c---warujoxex.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f12ce4d261---25194767312.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e3e98c98a---39865332331.pdf
    • https://mtmnetwork.net/uploadEditor/files/86903509739.pdf
    • http://haozuowenwang.com/imagefiles/file/totidubuvosa.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1606f98531f25b---45647069990.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/r6kt06g5namc1i2i0lip67d06k/31925427687.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/462917c514c4fabed874aa62eaa3de2e/15737021810.pdf
    • http://farmaciafici.com/userfiles/files/zonotefizasudezorirerurek.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/003f70a3e6b57351df7d5f5b370d43da/gotolutefevoz.pdf
    • https://bio-obst-und-gemuese.de/userfiles/file/muxinaxenozizimazemil.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dbdc3a798f---24021599215.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/b75nlsimtflj38tfvd8nj1ei5l/zopuko.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/baj0ktsgs0glg4086hfvl9m3d1/puvulikebaxu.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/ja1qbsel8bgoeqip8pg20b1l57/kizal.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/27e7761e299d4a93b00d4f82202c3704/18290680888.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=sale+deed+without+partition
    • 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_off0000e4cd.bin
12bdfe2b20f72aa908588bd913a0e6d0b618a7972106bc064f4dc302747e79bd
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CD 10584 bytes
font_01_sfnt_off0000fce9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE9 16792 bytes
font_02_sfnt_off000114fb.bin
3e07c99dab761369abc510c32fcd97aa3574f308aab0baa7b5dab7135a6b599d
pdf-font-stream PDF embedded font (sfnt) at offset 0x114FB 17560 bytes