Malicious PDF — malware analysis report

Static analysis result for SHA-256 fda426deddb222c9…

MALICIOUS

PDF

77.5 KB Created: 2021-09-07 00:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b2b9991762394d844a56f31bed046055 SHA-1: 01260f53f8e4c726dae191f125598ce3357a514e SHA-256: fda426deddb222c976602171d39702b6a0203c150ec6361a239026ab68246162
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its direct intent beyond hosting links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://kalikraft.com/images/file/konib.pdf In PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/mekama.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/82929b21390f71927f36f0d4d354a790/53352998719.pdfIn PDF document text
    • http://chinocorporatechallenge.com/clients/6216/File/susabuxatowamapazosin.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/zokizumaxikazibepuzuguj.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160af88049e9c1---42758932623.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/2gg9845hpf44vmscvim9qsi68v/danexifipumibunukafeka.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/jewajidikapu.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/155d29710e2a83b8b078a00b09acc400/95377979734.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/cc3d0925b9d5909c1d8ffca0bf9823fb/11859556111.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/derupelewemakizesa.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/joduvitutafifagos.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/10228591084.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/lexod.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/dejekupedikak.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/51913330115.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/vazopawejejasu.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/91894250064.pdfIn PDF document text
    • http://chromavials.com/d/files/57312214852.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/ciub8uepuuim1td5m56qfvaep2/222110893.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///niguxubomosigazod.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/75rchahiv2dvg4boan71iu5mjn/lulejuvoxopivevomuvu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=economic+entomology+pdf+downloadPDF 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_off0000c702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC702 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF19 10880 bytes
SHA-256: 84c1897b06a8ceae2207f3e5b229a0d75d9d3456d32c48ab3ac89372fe21d264
font_02_sfnt_off0000f812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF812 18580 bytes
SHA-256: 4d6277a6d56f324998403dd79693aa90df94e403301b606b7ab5e3991912f4c2

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