Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1d1e250fcc32b03…

MALICIOUS

PDF

90.9 KB Created: 2021-06-26 23:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 08e270cb724b4897d2ff964d059d5f4e SHA-1: c6594409e6a7bfd1af037df3e389fabd228b6ec8 SHA-256: f1d1e250fcc32b03c75b1ef33d114b11dcbfe6b2b2096a01564ee9b8f0da853c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other potentially malicious sites. The presence of these links suggests an attempt to redirect users to phishing pages or download further malware, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 6

  • 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
  • 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 http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160835c02a7f8e---zufajubijo.pdf
    • https://grandhotelbulgaria.com/userfiles/file/guguranikototefivoveso.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16084ecc7c206f---dewumajinapeg.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/82ud3eas2hlsdlkuk2jsbdb9en/69135759532.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c226be6d808---wigepopaxisogenikesiti.pdf
    • http://diysmart.net/userfiles/file/88466274160.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/15b9e81c2acb54b53e6d13c616117ca5/23628648414.pdf
    • http://omonetach.pl/foto/ilustracje/file/sovibupimijaneli.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834b4d5bb46---gasifuwis.pdf
    • https://infotechb2blite.com/bot/ckfinder/uf/files/nutenesikusup.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/mmpg2fm6bh12s38fl0ef8736r0/rojeretud.pdf
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/dc7304ca0d460e364d0edd6710c3680f/58385032731.pdf
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/afbadec0587a58936f59e8d0cf106ccf/31326307600.pdf
    • https://arte-salon.ru/upload_picture/xopokojamanod.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/ce3438886264cce8c5eb830662e86f46/nodomip.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607318f84ad26---muzaxawidupuxopokagif.pdf
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/61c32a357d8837bbd3c3b26897ecd71f/nuvamidijowurozi.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609efeb40a5c1---damobitu.pdf
    • https://amursvoidom.ru/media/files/zumawaj.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3796456d1---88704260053.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098836e97727---poreruje.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160cfcd14a4876---50426756243.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3308621fd4db3d9ad9ff012739de17c2/76566631078.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987ca022518---45804637199.pdf
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/fe1ac25b40f0aa2a5050fb2c951711f1/losumozuv.pdf
    • https://shop-ecobati.com/medias/upload/files/95725549123.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/22cb7cee46bde1d0233bde24ec6108a9/9942913083.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=list+of+canadian+diplomats
    • 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_off0001026f.bin
f9731635872bac0b10640477cd33b4c43c419e1d3a87d1ec9736d07431da051f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1026F 10504 bytes
font_01_sfnt_off00011a4c.bin
5d60bd1fd52a66b6399872edd3d3c5551d8b8498c1a7d5b13d2cc9d3b148e4e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4C 17012 bytes
font_02_sfnt_off0001460b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1460B 16792 bytes

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