Malicious PDF — malware analysis report

Static analysis result for SHA-256 60a6f593bb3257bd…

MALICIOUS

PDF

87.5 KB Created: 2021-08-14 23:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 817e0c6779b2b94cd22b9306e7a14191 SHA-1: 277cf89237d1600a6436b23d2fab2ba5e8901030 SHA-256: 60a6f593bb3257bdc4de82c81ff55beed15379abd4a870f469d217ad5d99af4d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests these links are intended to manipulate search engine results or lead users to malicious content. No scripts were extracted, but the presence of multiple external links points to a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9883

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://md-servicios.com/userfiles/file/53068515829.pdf In PDF document text
    • http://statewideroadservices.com/clients/879378/File/10152733444.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f60938eb723---19472139620.pdfIn PDF document text
    • http://01host.ru/userfiles/files/15595131798.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/38760305402.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/woxogiwidu.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/87786583420.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/54724161299.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/5f9s0kd8o681hr4nptjbjf8g97/49680570182.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/7192885823.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/58882293405.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/613f67d1d59b62f214b4ee403e4404de/pobagebuwofevo.pdfIn PDF document text
    • http://elite-weekend.com/clients/9/94/945a7f92a07ecc721aac768ad340748a/File/29942270788.pdfIn PDF document text
    • http://eastcity.hu/ufiles/file/93862554412.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa59e5e24ed---vekenukobudemo.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/disusi.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/danofarezobadojepogi.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/tazapogawajepokapikadex.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/vfaoa9b1ps3f20rgven5fc2vf3/82657115259.pdfIn PDF document text
    • http://mayamalay.com/clients/874202/File/57387745948.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/30728137859.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/d69152730a15c9364d8e61f9e409056a/76457998452.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/35nlch5rco82m30sko5sktncds/32226447704.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/vulone.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e01ef453690---70178871225.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/8f59f43669422c3d9f512dd7ab000c1e/lagavenewesitumupokixupan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=why+does+my+acer+computer+not+turn+onPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF329 10848 bytes
SHA-256: 4adb6a1c8bd78c4be99feee216b9752c12f411391d2621cf37830e4a42df0db0
font_01_sfnt_off00010c0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0C 16468 bytes
SHA-256: 93e81316f0a277ba3e650b756a1e4c7649dda1160c32c0255bb89b8bddb1b5f6
font_02_sfnt_off0001369d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1369D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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