Malicious PDF — malware analysis report

Static analysis result for SHA-256 74897c37a9d7733e…

MALICIOUS

PDF

77.1 KB Created: 2021-09-07 19:28:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 94f77dee34df50d7528235577b8e9e51 SHA-1: 67ee5bfe71fe73da21e0a64b6865e5803ffb8551 SHA-256: 74897c37a9d7733e60ffff12cc3714675092c9e4bcb7c32ab180ee342de502d1
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress upload storage and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm suggests an attempt to obscure the final destination or spread malicious content across multiple compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://sosonomo.com/ckfinder/userfiles/files/713387757.pdf In PDF document text
    • http://files.ibiza-ferien.de/file/40173565391.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/18762056998.pdfIn PDF document text
    • https://rm-parketi.si/uploads/jebitalifamibipos.pdfIn PDF document text
    • https://fultoys.com/userfiles/xakanidivapikojuwatagol.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b88b77f062a---fimoforivonazoxoguwo.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/putufugigexapa.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/nijezemeganeve.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/4p5g6bejpakn2u9oqefnb6bdc7/wikefojodalarajizosunis.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/15301051730.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/jkn48bpntmagflrsj6gdiidpkm/sokewefenafogi.pdfIn PDF document text
    • http://smn68.com/clients/75339/File/48565723059.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/94937591777.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/2208d20e7ea114b232c1a84b8aefbb77/40618102121.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/zuzemomajebasuwosevot.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160a932d176f8b---jubewavi.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe09d67188---89369892844.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/dapakaxut.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/xuduxis.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/gipategijuguf.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/tubeledazaputoriwapezorun.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/a1d236ba2fcf2356096dc32ea2a4e30a/34392841996.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/84160703287.pdfIn PDF document text
    • https://srmhospitalities.com/images/bulk_images/files/10195095742.pdfIn PDF document text
    • http://hitmet.slektenkaas.com/bilder/file/3172655112.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/pibusezelowudek.pdfIn PDF document text
    • https://master-service.ro/images/file/koxojijuguxatinigiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=noun+exercises+worksheets+for+class+3PDF 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_off0000ca59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA59 16668 bytes
SHA-256: bf0e8c555e9104bff6d2acafed9b65cd946ba7c8efe4886c748dad0f53dc379f
font_01_sfnt_off0000f4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0F 10964 bytes
SHA-256: bfb407abf207ab49209df641bdab7757f79b354aef17e7b12774b1b5751d314b