Malicious PDF — malware analysis report

Static analysis result for SHA-256 071f37cf49286649…

MALICIOUS

PDF

87.4 KB Created: 2021-09-24 01:14:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9a2b304c8e08249ff79226643ab8c61c SHA-1: 935b4c45955d21013509d68f28c87bb5125aadfe SHA-256: 071f37cf49286649fde2cf29a17824d184d0fbb29ad344a0d8191b1a15a13df9
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are identified as link farms on disposable hosting or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest an attempt to redirect users to potentially harmful 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 https://drafthe.ru/uplcv?utm_term=board+game+apps+on+android
    • http://cableesmaltado.com/d/files/99179462765.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134a9ac43649---wapomef.pdf
    • http://coeb.eu/userfiles/files/11639318367.pdf
    • http://centrlita.ru/archive/image/file/23320612545.pdf
    • http://capital96.com/userfiles/file/vuledufazedebi.pdf
    • http://w-mill.jp/images/file/54111664161.pdf
    • https://netiko.fr/img/Data/file/88711091992.pdf
    • http://ingegneriarossi.it/userfiles/files/xufopajagadeluwetuwapake.pdf
    • http://jagdrevier.hu/upload/images/file/28460467540.pdf
    • https://calmoinc.com/upload/editor/file/98687661201.pdf
    • http://huucodatlanh.com/userfiles/file/moxojikesijeduweso.pdf
    • https://godahoian.com/app/webroot/upload/files/banukomemukenobupusufam.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138b9978695d---kagaresumokebuwe.pdf
    • https://hinodanang.com/uploads/image/files/mexefewu.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/tm1ba25tvsq5ffs0dmutfhu882/sekepulugexapikerofuwur.pdf
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/xawejujatatoxe.pdf
    • http://showplus.ae/userfiles/files/nikoxapenipumered.pdf
    • https://arbormaster.net/uploads/files/87311985099.pdf
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/84791085708.pdf
    • http://ahjygjg.com/upload_fck/file/2021-9-4/20210904023050919586.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ce3234821---12950691700.pdf
    • https://rtquery.reitoken.org/Coaching123/images/files/mepufajujazizuwori.pdf
    • http://studiodebiaggi.eu/userfiles/files/kusazusinexaduror.pdf
    • http://kalikraft.com/images/file/kupafugelodusokiwe.pdf
    • 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_off0000f347.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF347 16792 bytes
font_01_sfnt_off00010b5e.bin
b413fbad0b6cd7ac9f3cdd71b2e46abcd6fe34756cd2d3f5105f0eb0ad884136
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5E 10644 bytes
font_02_sfnt_off0001237b.bin
e2bcb57ab1c0190cd22e0872f98480a92ebed3f5c65f1897af7314fafc9b21e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1237B 17160 bytes