Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffbf98a9b2213d2f…

MALICIOUS

PDF

88.0 KB Created: 2021-09-22 12:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 66029697423adcffa0b77f5b4ec78a42 SHA-1: 8772b50e172aaba3531f12dbea9e4c1d2cb3be96 SHA-256: ffbf98a9b2213d2f87e4ea1466be035583eb3c9b5ab196fd14e050ffa1afd0e2
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to various domains, some of which are hosted on compromised CMS platforms. The primary purpose appears to be directing users to external sites, potentially for phishing or to download further 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://toflight.mobi/attachment/ckeditor/files/a92d7d8c21a81b4d72a6e7c1e0174360.pdf
    • https://www.esfa.bg/root/ckfinder/userfiles/files/9440832528.pdf
    • https://snqrsl.quebec/upload/editor/file/zugonalajil.pdf
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/doxinagaloporoti.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/b96e0fd33f7e6e60b98ef6e830330ec0/25660953646.pdf
    • http://sciattella.net/images/file/18686783662.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/b3cb073d6d01c664692b6c5e44e6bcc1/3100448070.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161421bc513867---jikaxuzenabagukenoj.pdf
    • https://bolahijau.com/contents/files/88871546322.pdf
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/dazegivux.pdf
    • https://moveo-sport.pl/userfiles/file/61826196208.pdf
    • http://kaies.cn/upfiles/file/4484258991.pdf
    • http://www.pics4us.de/userfiles/file/15726661210.pdf
    • http://lindseyderence.com/userfiles/files/fumejiwa.pdf
    • http://kamerton.nl/clientfiles/35368036638.pdf
    • https://sherwoodchamber.org/ckfinder/userfiles/files/40782884618.pdf
    • http://brain-sh.tw/upload/file/bilugefamusem.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a3afb866a9---vivopamibamo.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147a7419d97e---kasivajagokenosi.pdf
    • https://verandapattaya.com/userfiles/files/musepafeti.pdf
    • https://flour.co.uk/ckfinder/userfiles/files/kumujerem.pdf
    • http://agro-pasz.pl/ckfinder/userfiles/files/21943024687.pdf
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/xososakak.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=it+full+movie+watch+online
    • 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_off0000f5ac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AC 16792 bytes
font_01_sfnt_off00010dc3.bin
d6c4d5d04ce83214896efdc68a46aa7172bf17182f72d5a5b5118872389670c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC3 10536 bytes
font_02_sfnt_off0001259d.bin
a8bc317a8680d05d514ca1f4c666c93042842ab7a56b1283ac446b2cfb2f81be
pdf-font-stream PDF embedded font (sfnt) at offset 0x1259D 17596 bytes