Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f121f734974325b…

MALICIOUS

PDF

88.9 KB Created: 2021-07-19 21:32:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7c3faaa8dda096a6f999a6054872f87a SHA-1: 9563a5e113fd0b58f076290792f2cdf65dcaaeae SHA-256: 7f121f734974325b11c23fa2539ee868292a9e79078787973bec0775b5b649b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, which in turn host other PDF files. This suggests a multi-stage redirection or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://ofertaromania.ro/ckfinder/userfiles/files/77313995050.pdf In PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b474ad16d11---fidipifu.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/20888167843.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/117q3v8o9pp5v0i4dirjo1o9fv/55803497458.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b1fd343052c36e20d1a7cc3aa7fa873f/luzobibufewoto.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/2a4cadba406848106b00dde246319fb4/tokufe.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ca6249aac2c---rugowimevanav.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f592030a2---nabokorogudanox.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160871e0c5fd20---niwasezazusalozuwot.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/3a336453073adb0caf6ff05c9243df10/86729482682.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/filuja.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e21b925db7e---rifomuligosavatubebifidag.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072968772b40---gepogedi.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160860ce42c99a---bejifofin.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/16849238847.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/sugevez.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/3f73066d9b5641c8da7fc492bf2c1936/tipumekivujegol.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/53069723618.pdfIn PDF document text
    • https://sukaunited4d.vip/contents//files/fugalekonikuserewuxorimo.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/0e1709f2375de3f213d9890d756c5097/ziludape.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/dizida.pdfIn PDF document text
    • http://suttonoakfarms.com/clients/880813/File/togokuzujalafuvikumul.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/d3c37d916394523a8fd39deba710d761/surebufurexu.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a6986caf0be---90757329420.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ed06e5de54f---refugirav.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/lofikigamabeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=can+you+eat+brussel+sprout+leavesPDF 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_off0000f807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF807 16972 bytes
SHA-256: 59d3f44405cdcbeb3548bc3f4d661060a865a7d2ad0333b582609f2820257df6
font_01_sfnt_off00012417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12417 10604 bytes
SHA-256: 0fcaadffa91f0e44c131eb4e8072a4d3b8133b1dc3d428c9c5f25bc09b320a44
font_02_sfnt_off00013c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1