Malicious PDF — malware analysis report

Static analysis result for SHA-256 71bd113c8b2af555…

MALICIOUS

PDF

77.8 KB Created: 2021-09-08 02:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e0baf8da90691bc74376c0a57b9c027f SHA-1: 19b2eb46b02d7f476536ea1ddd94262f4c1fc299 SHA-256: 71bd113c8b2af5554f63fef1614f8c5eddf6accd6bddbff17a2dc2909ea7fa27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.cavice.fi/tiedostot/files/48322483584.pdf In PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/3ff878db0622f68ca8fa7d72b97798c5/nubakuvesagofe.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/guwine.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/lobafoneda.pdfIn PDF document text
    • http://thebrownsfamilyreunion2008.com/clients/81208/File/94308674041.pdfIn PDF document text
    • http://gespk.com/userfiles/file/neropobupe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3134094c27---sebuxopav.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a33a7d92f5---febevabawezamifajowisopab.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/milivukenadurejeximivemi.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/xigewarolexatewonepuzud.pdfIn PDF document text
    • http://hkacca.com/userfiles/35548075644.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/68270370627.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae551cd8fa7---35728739710.pdfIn PDF document text
    • https://dpmceramiche.it/file/dajipijonatuwaligatosi.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/174f10039a1e7dfabbf746386f4d66bc/kudidaviji.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b752ba1505---92855265347.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0168ba1b5---67103555182.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/50877535275.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/56367217021.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/36231497004.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/rikemugolexafukutisafawod.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/defelatemolonujovopoweb.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e1ed3135555---kajumosuvitemesovumiba.pdfIn PDF document text
    • http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/23322820287.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=etablererpr%C3%B8ven+for+serveringsvirksomhet+pdfPDF 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_off0000c6fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FC 11408 bytes
SHA-256: c6bd2409bc124fc030176f40581cab27dad432e837beaf7fd44e1523ccb8832d
font_01_sfnt_off0000e151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE151 17532 bytes
SHA-256: c96bba2b616ffee0f1adfc14706440225c625cceed66509664c5ceb6e2a62786
font_02_sfnt_off00010f06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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