Malicious PDF — malware analysis report

Static analysis result for SHA-256 c64bbfeda6611985…

MALICIOUS

PDF

82.5 KB Created: 2021-08-31 08:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 87de68d446a530a7b3a53f703213b8b4 SHA-1: 2be4cb496ebd747be211134725d97d56289e0552 SHA-256: c64bbfeda6611985b48a15ea981fc3a550116bdeea18462e85e7459b3ff2b301
156 Risk Score

Malware Insights

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

The PDF document contains a link farm, directing users to numerous external URLs. Several of these URLs point to compromised WordPress upload storage, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://klhl.com/userfiles/file/58092890203.pdf In PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b657802f8a6---rugetaf.pdfIn PDF document text
    • http://simonide.org/userfiles/file/zapurokuvapa.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160876a2b165fe---mubizazepag.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/pedasesuregis.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/pivixededuv.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/87jpldlgd3eqgqli4uq43jt73k/4428500894.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/ruzasizurevudafegizu.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/dj6916fr5tjbssord9ub5rbkc1/54061464507.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/foxufigopu.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/zusifuwaruxadevumotud.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/d537964e12b0161e244138ac8be8af7d/wejoronimesidigitigizekuw.pdfIn PDF document text
    • http://zimaletto.com/uploads/file/zolukogebeweregadamabipet.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/ziriwafupaluli.pdfIn PDF document text
    • http://parilka.by/var/upload/file/84611840995.pdfIn PDF document text
    • https://diamond-marketing.cz/soubory/xifalopolivemexazonovu.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/23897677860.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2837b2c53---69837634082.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/livozevomawifejipi.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/317c74e592502bb3be523ddb4ef96007/75696371750.pdfIn PDF document text
    • http://ruresept.ru/files/file/51801086648.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/kukatarefimibabekepo.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/021bf359bdd5b3326a0ee7f840429721/7007315871.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/o14ivhcnnbdpo94vjget04pkh9/noniberitetolesix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=wood+and+steel+architecturePDF 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_off0000de35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64C 10560 bytes
SHA-256: f889d1bdb0d2ba6233f01afecaa3b40905438a61b93afeb07c09e67574f43268
font_02_sfnt_off00010e50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E50 17508 bytes
SHA-256: e69a205053ae2ed92e10acbb4021ea398b69f6e933fcdb93bd00c64893001188

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