Malicious PDF — malware analysis report

Static analysis result for SHA-256 b18cc1be484f1865…

MALICIOUS

PDF

83.3 KB Created: 2021-08-20 14:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 71ff7c05542092eedd0ad659b1c9455f SHA-1: 6daf4d43d3266618069ebab6cd093b64a6ce1911 SHA-256: b18cc1be484f18655aba9b71f07d80e3f810c120fa7623d91a585b2e33b8a83c
156 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of multiple unknown URLs strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://maximatrimony.com/ckfinder/userfiles/files/47893454367.pdf
    • https://termokingbt.com/ckfinder/userfiles/files/rajisolavidimolobetuf.pdf
    • http://londonjip.com/userData/board/file/kisovova.pdf
    • http://plncse.hu/php_data/file/58109189608.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884161c551e---43483118421.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/qnvracjsmpmobqo2fapah8lm09/19801615753.pdf
    • http://eraldocomo.it/userfiles/files/zewimevifuja.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/b15b68e569bba29af98972865a60bbcb/57747304133.pdf
    • https://aradovan.com/userfiles/file/rupovujuzepaxevu.pdf
    • http://citadelcaralarms.com/userfiles/file/64886514561.pdf
    • https://www.idd.no/ckfinder/userfiles/files/lilasabaj.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160791f4b43e12---80920745053.pdf
    • http://americanewbie.com/userfiles/file/59041624682.pdf
    • http://asijskepotraviny.cz/files/file/jeranad.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa713bcbe9---geraxadabanud.pdf
    • https://xo-sound.ru/userfiles/file/tabidovaxowirev.pdf
    • http://perfekttorun.pl/pliki/zixabedijo.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4efe3cfe9---13146097697.pdf
    • http://matsonconstruction.net/userfiles/file/73516930504.pdf
    • http://xn--b1akwe.xn--p1ai/userfiles/file/zuwukixilovepili.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a51c563396d---mukerobaxosoxosuzofuf.pdf
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/terebetesobuw.pdf
    • http://bmcnx.com/userfiles/file/15758824250.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=the+selection+series+gay+characters
    • 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_off0000e0c0.bin
3e98f8f16f497c130dc430dc5bcbb1c97ebbc623bc6fb81bac18d86a11f4b509
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C0 17540 bytes
font_01_sfnt_off00010e53.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E53 16792 bytes
font_02_sfnt_off0001266a.bin
3884ecbed6a46bd22b0cec6067fd0688d37f52f5321276a247dc9db1b826b858
pdf-font-stream PDF embedded font (sfnt) at offset 0x1266A 10588 bytes