Malicious PDF — malware analysis report

Static analysis result for SHA-256 f95867d3fbce2e4e…

MALICIOUS

PDF

86.7 KB Created: 2021-06-25 15:22:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0efab46a6cefd963193e953208d59645 SHA-1: 4abdb2b0e1ee847ef3e63a1b62e23e914967a096 SHA-256: f95867d3fbce2e4e2baa190bced5919fe154189859e56ee7496b7889a4033336
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The embedded URLs, such as http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/qi2dt822e0v9blkcpi3kl51et5/viferobowozikatuliv.pdf, are likely used to distribute further malicious content or lead to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607487c82dea0---ribiliso.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/qi2dt822e0v9blkcpi3kl51et5/viferobowozikatuliv.pdf
    • https://smsenerji.com/resimler/files/kutowuloxokeseju.pdf
    • http://carzip.biz/files/uploads/files/49484438890.pdf
    • http://ifaistos.reality.gr/~triantaf/images/file/16073207901.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b288291a489---fajewopodazenewul.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/f1b09f75a88a837cda2870be605a449b/gidirufonelijosixapu.pdf
    • http://sujitonweb.com/userfiles/files/dexolokeretulapijuri.pdf
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/pamateguku.pdf
    • http://kleiberit.ru/files/file/36068997318.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0187cc59f---zulaz.pdf
    • http://ozdoby-betonowe21.pl/Upload/file/45836451627.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d03c59c326---50023086481.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/p5nrcfivtghf6mag9pb1dca9cp/kuvosos.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0877c8d38---39648214992.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/ctie5hng7dfvp4lgtfg95ip633/lezegazijinebawupo.pdf
    • http://akcjonariusz.com/UserFiles/file/kenorelofozilur.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=the+conquest+of+happiness+mcqs
    • 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_off0000f12e.bin
4e7ce7449d0d78ae154944ebd120a69200e81aea8bcc9d5a5d7ed57881d238bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF12E 10808 bytes
font_01_sfnt_off000109ee.bin
d607a007fb846013b09e718d4f8a784e0736e49011b5557767eeeb58ec2e1c65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109EE 16444 bytes
font_02_sfnt_off00013466.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13466 16792 bytes

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