Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f7452aaab5710fb…

MALICIOUS

PDF

94.2 KB Created: 2021-07-01 09:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f94cb7b1d72c5f9d6a40dd9d4156013 SHA-1: d09ba3d58117eeea96d177bc5c6634c533e1992c SHA-256: 9f7452aaab5710fbad9832e7af2e73e6588364e198626d22b252a6d710ff66d4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of a 'Password-protected archive handoff' heuristic suggests the document's purpose is to trick the user into downloading and opening a password-protected archive, likely containing a secondary payload. The embedded URLs point to compromised WordPress sites and link farms, further supporting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://detectiveoffice.net/userfiles/file/fewiwote.pdf
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/b4c51a6f286c33547fd4c4130d10ee9f/xasijodopovewapaxojop.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776ce938827---tuxazuboxevodir.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/94fadb1e96a78882a31576b633511494/nonepuw.pdf
    • http://soupworld.de/upload/file/97118857542.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/98dda3d2882108fb8386dcff12e66c5e/rokuxabokowagifinaruvev.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/4bf9b6238666ffe83d0d54bb12e6720e/63209751957.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b48ac122677---10078866288.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/b03662e89630b7c8d0775a59334612bc/bulurajemujibududewewevi.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/ta6teu6s56rtnje3ed48opud37/majipor.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b5961ac9d---98360621778.pdf
    • http://hi-techfiber.com/userfiles/file/boxanizegenivebovewifav.pdf
    • http://ahsaipu.com/v15/Upload/file/2021551845304198.pdf
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/91da3e4f7703df3254f9744bdc855be0/zexapekenesubezeguwumu.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/897c7a28a22fee0436102ff2ab918f75/38854149626.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/ajjed2so7iov803q0hg71gmilp/pinivituxuxuxotelimo.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/qtlvvr71p6k88375b0qs53ja00/58242862068.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3dc41b4b3.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/85587458120.pdf
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/l2te7fvj5linjctb03igp4ksnh/gekafematowonozokotatak.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/pbheav8ipb4d9m74mr8j2rrght/82725969870.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed573c51df---pobazodegevotutabowezer.pdf
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/2rkf318llb12i2nrufoiu8bikb/68622490512.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+work+out+the+area+of+a+right+angle+triangle
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f26e.bin
ed593fdee7be3bed49030b81c8116929cbc84e15c09b1800709cd76e1364d58f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF26E 17748 bytes
font_01_sfnt_off000121b5.bin
5b8125f3be2c05139b03a97cc6c1d86af885926e650e28725b9b240310d7a86d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121B5 10592 bytes
font_02_sfnt_off000139da.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x139DA 16792 bytes
font_03_sfnt_off000151eb.bin
0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878		 pdf-font-stream PDF embedded font (sfnt) at offset 0x151EB 16448 bytes

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