Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b0b67e4781291cd…

MALICIOUS

PDF

90.1 KB Created: 2021-06-27 22:44:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 08f5dcf26e4c807ae2a13e2894d2b25f SHA-1: 38477ec64a0fb0892993e566dbb67c453c42fcff SHA-256: 6b0b67e4781291cd0efc715923d900d5c6b0f7d3f2ff4ac8d0dcc25aeab00684
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely designed to redirect users to malicious or phishing content. The document body is unreadable, but the presence of multiple distinct hosts and a high number of links suggests a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca7979a673---xeregapaverujeganeviw.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/3b2589fe8611f8b73cec74bf3dfc70cc/36529686105.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/402b744d9e4169d6d9239b1e31d80c8b/xikepebutopuros.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6748d1750---79812097021.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9aff1057e2---93708296837.pdf
    • http://dolphinkorea.com/files/files/mefimawadaziripeguvujit.pdf
    • http://colorfulmedia.de/fotki/fotki/file/zevoragubamixejejuwu.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/9873f6d3773ff6db214f416652e4b3f4/rupitezumalekig.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160744ae531385---45758180981.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2efc93eaf---vuxibado.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609884cb5c3c7---dafobinekalavu.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160abf44acdebd---63378841529.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/vpc03v7ad9kc24gqc2asoukvr4/virabolulupagamoson.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/d2f620dfe8ce41aa3dd176f27fdb67a3/15752564976.pdf
    • http://bkdesign.ee/userfiles/file/lotodazowonovexo.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae4030588e---bewal.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/c20fdce85039b2c197002830fdecb100/50843912584.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160987a0dd3fc7---43264085505.pdf
    • http://andrelandberg.com/userfiles/file/topatono.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ee1f819ce---lolafuti.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/u3p54cmonlntrc9tekmci6jrrr/75036876494.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/7c3b9a3530467e6fb69e042a5707cce9/woxonuwovuwezuve.pdf
    • http://iehyun.com/editorupload/file/kebevibaxuj.pdf
    • https://fertilizergranulatorprice.com/d/files/mewosugezitodenejamuna.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/98b8ef88b4d1f71e9a95e3d7364eb406/59930422200.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=transport+from+bayswater+ielts+listening+answers
    • 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_off0000ef01.bin
6007c870d64bf94b867444e8a0a478f227176ddb23ecd44820f1f50976639fa8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF01 26116 bytes
font_01_sfnt_off0001294a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1294A 16792 bytes
font_02_sfnt_off00014161.bin
83ea00c7af7f4ae38dbd3764b2baf9ada196d64ecfd6dc3296bc27fd8d42e6a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14161 11004 bytes

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