Malicious PDF — malware analysis report

Static analysis result for SHA-256 9208f2073d39706f…

MALICIOUS

PDF

85.4 KB Created: 2021-07-01 12:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 8f1c8c6e0a816c7682a9a583164cbb74 SHA-1: 9430d310486f65fa11e3738e9b5a401a26b8c214 SHA-256: 9208f2073d39706f45af7b680e0e1e4484bed4ac09f542a6a36d4c5e44d531d1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites for phishing or further payload delivery. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs further support the link farm and potential phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160867fbd15644---70383818196.pdf In PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1609eeadf43c00---tuvutunowupigunadozise.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160961f4c592d0---99089223896.pdfIn PDF document text
    • https://flyfinz.com/userfiles/files/38547831364.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/0debf297ce91050db6337a07b7f6a322/67308344318.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607875e9a30f9---pupowerifexe.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/kulurivajis.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/oo11be30mlae2ap43tr4e05fci/46593130460.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/87731783263.pdfIn PDF document text
    • http://keacg.com/upload/files/18028393608.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/gibizafarapezuwigifasum.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80d9a28925---4072053577.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/sirofekijijilatevosoz.pdfIn PDF document text
    • http://heureka-cz.eu/files/wisixuwabezax.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b45f2ba9093---turivomalekofogejuneremes.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/9585073735.pdfIn PDF document text
    • https://tonitomov.com/picture/file/98827331082.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/31902480613.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/3620836218.pdfIn PDF document text
    • https://gregor-biffiger.ch/userfiles/file/nejoraku.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6345a044b---16330593205.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/sakif.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607313a3324d6---naxodopapavaza.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/mupesibefu.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/92010812909.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/b5a9e798b31a352b8cb244aaeb9ce34a/18064642165.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=types+of+pressure+soresPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD6 10024 bytes
SHA-256: 960f54e384caf90b56fc901144f48a6b46680775185d111646f293fbd97da37b
font_01_sfnt_off00010444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10444 16292 bytes
SHA-256: c3714f105f208b9d88eec21a9531909d63cc5e41560669b34b67c72ac3e3bc12
font_02_sfnt_off00012e9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1