Malicious PDF — malware analysis report

Static analysis result for SHA-256 f93b4e74e865a2d2…

MALICIOUS

PDF

81.8 KB Created: 2021-09-07 07:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5e5a3857c1f785c8ce17085377ee149d SHA-1: 72be0db9470f02ac5a0dd35c9e40af9c68c48342 SHA-256: f93b4e74e865a2d260d256e6146be493053260ee9e808d4d2383f134f50a33e6
124 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with multiple URLs pointing to compromised WordPress sites. These links likely serve as a distribution mechanism for further malicious content, such as phishing pages or malware downloads. The presence of numerous distinct hosts and the use of UTM parameters suggest an effort to obscure the ultimate destination and potentially improve search engine ranking for malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4470

Heuristics 5

  • 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
  • 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://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ec1a904bf---guvafotawizejafuwuvazaf.pdf In PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/ad81893a5bcb88e19cde013b3179f494/6787301033.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160abd3fdd255c---36203766755.pdfIn PDF document text
    • http://ccapostolicchurch.org/clients/1/19/19d200bce63520a637954fb60b162b1a/File/72752606468.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/majixozarejejusuxax.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/59123342250.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0574b2050c---luzaraka.pdfIn PDF document text
    • http://deficanderel.com/clients/6/67/674a09facce11b7629d390eef9534ff9/File/putijiwagovevas.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa34da12306---44300226343.pdfIn PDF document text
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/puwaj.pdfIn PDF document text
    • http://sartor.ru/upload/files/fuxipusabujuju.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/49716853136.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/7441256347.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/46035967714.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f92321ee61---bubimotuzebaw.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/ospr6qgu4tukth2igog5n2tef3/48374347543.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/fe542469b2a44f48bbe7c32cd08714d6/8486280848.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/xotisejepikepuwufufudixi.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/gusupezofamojexigok.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607473768697d---rumekujuxevawatij.pdfIn PDF document text
    • https://samowar.me/userfiles/files/98088367149.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/e2e29052da119cb27f60aa74ba5e1c32/43741942296.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/21299744835.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bbc74203e---8072762558.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=inconstant+moon+short+story+pdfPDF link annotation
    • 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_off0000e9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B4 17880 bytes
SHA-256: 968709a689a388845c3462770d4ee951f6f838b1e5d29daf1de6ed4c672b5d82
font_01_sfnt_off000117f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F5 10680 bytes
SHA-256: 8dfb44a89d76937a1c69acc79668b5b163c254db1d1703f17766bc3ff05702e3
font_02_sfnt_off0001304c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1304C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1