Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f91db15f2abf51b…

MALICIOUS

PDF

62.3 KB Created: 2021-09-07 06:55:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fbc52242ae41d2d294bf1b066853c40e SHA-1: 389845372ca16344bab01b5e9837df285da33e63 SHA-256: 6f91db15f2abf51b3f20cef1af466ece82e0a0bb90da37a7eefc3adc8794b4ca
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to exploit users via malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9069

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ede3eb64a6a---85180947875.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/b7a79558907e0c0fb49ad5a868fbe3ab/92928284443.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/651b4a99de9dfeef975f78e10f02a220/nakurozatiwosejutonubow.pdf
    • https://zionapostolicministries.org/uploads/file/buxove.pdf
    • http://soles2walk.cz/data/file/20614737877.pdf
    • http://noithattamphuong.com/upload/files/leroxoxipofuwubika.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790638c68c2---mudefuwutatedibuterak.pdf
    • https://sportsht.com/userfiles/file/jasuzuzufowodareku.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/d9e5c60890384ecb95eb830e1a84132a/rekaposulozigadekidu.pdf
    • http://hyosangjo.com/userfiles/file/20210803101049.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f174b4d959---jibezipezufuwotetuloni.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/e8m1h9llm83icik8a8mt56nvbe/xaneduxikaropeposevez.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3eaa9e839---14461172184.pdf
    • https://farmstead.tw/farmstead/upload/files/77116927149.pdf
    • http://edu-tur.ru/userfiles/file/vaxerudowi.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/4iidsltp3bl5vcf0k9f9maq376/26124697419.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608aea609053f---pevokugosimu.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/7fed749d69200d847d7dcadef1c32876/63594666341.pdf
    • http://igorodstore.ru/files/userfiles/files/gevokevu.pdf
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/95064203649.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160854f59ce8ad---11013097196.pdf
    • http://cn-daomeng.com/upload/userfiles/files/a17adfdf330512d9e84aee9534a77f31.pdf
    • http://smartraoptics.com/fck_filemanager_upload/file/84744183910.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f8af27f98---makudutufuza.pdf
    • http://amsaneeraus.fi/userfiles/files/kazisiwopexibiwadimafa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=torchio+manuale+per+uva+usato+palermo
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4bb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BB 16792 bytes

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