Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf2f5f31865052e5…

MALICIOUS

PDF

84.0 KB Created: 2021-08-27 21:38:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4fa4c6325bdff95099d928b70387ef8a SHA-1: 107ab851d8c7991c84e10164603f38d4142e2e05 SHA-256: bf2f5f31865052e5cdd62bf027f4155b0e5899b1d466333557bd90ead85744a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised CMS upload directories. These links likely serve as lures for phishing attacks or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202106221204582549.pdf
    • http://idcla.net/upload/files/jemijijegijutosabavawuvor.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4ce2df28e---gitorokubozamuzivuw.pdf
    • http://alessandrobelleseveterinario.eu/userfiles/files/kuvavarotofojejudij.pdf
    • http://a1-automotivegroup.com/upload/files/metoderolubanekejibo.pdf
    • http://shinies.ru/img/lib/file/ginevo.pdf
    • http://mmbc.cz/_data/user_files/file/jafonegasudiveza.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/8207bf0cb88c0381cdf9abe47335a7df/77733336519.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/i4tqossceojeb5ngkafi4co7g3/78316887033.pdf
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/pinidelomugurevexo.pdf
    • http://dogable.de/userfiles/file/15905934712.pdf
    • http://gld-lining.com/user_img/files/20977060689.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610786462fc27---89394104401.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3311580d96---jiwebadelekupakitirusu.pdf
    • http://anabakorea.jp/userfiles/file/pedizuxosetaru.pdf
    • http://kusadasidentalclinic.com/img/userfiles/files/soxafokilipibolarado.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/2badcd42c5f9e97188e1ca000cd51f51/kudulurofagiko.pdf
    • http://es-hanasaki.com/yamituki-n/uploads/files/kajalolajuxijokaberuxiv.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611331b8993db---14051167731.pdf
    • http://t-eamplus.de/web/editor/files/11719828413.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b6fb001748f---34021999000.pdf
    • http://kimhoatra.com/upload/fckimagesfile/69793527041.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/7c1d9d3d0ab6b2b1f1079b19bcc32b66/rafozigududosemib.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083b7a82652e---rilasosuro.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=short+haired+blue+merle+collie
    • 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_off0000e460.bin
c0bb96a0492625ac7d59c9c09cf2e8e7713f8cf530b57958424315f005c001ee
pdf-font-stream PDF embedded font (sfnt) at offset 0xE460 10680 bytes
font_01_sfnt_off0000fcd5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD5 16792 bytes
font_02_sfnt_off000114e7.bin
d35705e27b6bdba6a741bba3520b22fb94f544e895f3ae546fce14c30b4a5016
pdf-font-stream PDF embedded font (sfnt) at offset 0x114E7 17556 bytes