Malicious PDF — malware analysis report

Static analysis result for SHA-256 f41391bca14653d0…

MALICIOUS

PDF

99.8 KB Created: 2021-07-30 08:36:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ba9da67d343288b4a8f951a79bf7407e SHA-1: 5728751bdcee235067e2ec8fb333b68cf886549a SHA-256: f41391bca14653d0509063fcbe324a17654ed8f90a37d1a33ce2a0b6292f6697
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links pointing to other PDF files hosted on compromised websites, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for distributing malware or phishing for credentials. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://medvor.ru/uplcv?utm_term=helene+hadsell+libro+pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608689288a96a---niligaror.pdf
    • http://iberia-ex.com/images/blog//file/91688816792.pdf
    • http://omni-links.com/83846986863.pdf
    • http://deauville.ru/files/file/72945476950.pdf
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/055b9c1bedea517d1d479f1c69ea84f2/50089032517.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3264c1745d---7885528088.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607c27412da13---getalufiwulazavu.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/5a3cf6df59e922f8fbaae06bf163f3de/ripepoxuzebisuvumuvubu.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc66ed15f5---21878022831.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/hb0jdmtnb41cequ9k89dcoc4iq/88369954983.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/89d2dfd7a1ff92d716d6e8cfe0efb877/kelefixepujinonoli.pdf
    • http://msiutilities.biz/documents/35864509729.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/c1c39cb25d0641e7137cbc37940bb7d6/81838981664.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/1mrsp81ugq414rnkefifo4a6b2/84117769252.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987d76f1ff5---rokuzigono.pdf
    • https://ludifrance.fr/userfiles/file/malujerakizewozuminulow.pdf
    • http://morecoredesign.com/images/imageUps/files/22565857225.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/5be798754e62ed30c804f1a057b67818/sudomuzilawuduvuzuwugosaf.pdf
    • https://sitpchemcieszyn.pl/_sitpchem/file/tifatunonojufiba.pdf
    • https://haidangpc.com/contents/files/53965251399.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a418b991e82---texubagijo.pdf
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021070514263380554.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075943f484a2---29368327872.pdf
    • 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_off00010faf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAF 16792 bytes
font_01_sfnt_off000127c6.bin
c878bd955010ad4084532048fe705b5695495125ad5fe41b4a0b1556b7ed1073		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127C6 10628 bytes
font_02_sfnt_off00013f9d.bin
58955451fbf3d79a2d4104956e8ce0f50efcffd0f566482135ce261e442f82be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F9D 16448 bytes
font_03_sfnt_off00015633.bin
18dfeeb9bc0a151395a8d9afccd14aee995d6381cbdeb7c15f69cca6c93a62b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15633 19336 bytes

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