Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b6fa7200051f236…

MALICIOUS

PDF

84.9 KB Created: 2021-08-26 14:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b857262d603901017146f14dc752c93b SHA-1: be5f43dc86fcd3e4759f9e830c02d83ecaa7e8fa SHA-256: 3b6fa7200051f236674845dd46f65d34fe85591a859940b508a971dd4b66bbe8
196 Risk Score

Malware Insights

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

This PDF document is classified as malicious by ML models and ClamAV, exhibiting characteristics of a phishing and malware distribution lure. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document likely prompts the user to install a fake browser extension or update, a common tactic to steal credentials or install further malware. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it may leverage JavaScript or other embedded content to facilitate this lure and potentially download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16086f90be3a0a---45944221918.pdf In PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ab3ef333c6428f4e5e89fc1ba207c343/30691860839.pdfIn PDF document text
    • https://rm-parketi.si/uploads/40510817975.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/5ae50ce18907d19e48c79067abb5e335/xapumovugorisetifatojapo.pdfIn PDF document text
    • https://anaksemut.com/contents//files/mudurukerobax.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/20359531732.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d01aa993bad---wijidejezusujulir.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c66e6a3db3---gepikojinefedagexivur.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/vazenaxedefuwikimu.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/96220586655.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/migapodexitizifovi.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/tisuredivixe.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/bibivaju.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ad3e5840b---zojiwepa.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c89dff6706a---jelawa.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/f8e4e9bebe4d48ea4c3b9de3a6fe99f7/46890856054.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/49424231531.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4171fbfcee---76029881177.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/1120883977.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/cf5ddd96863b2be4b16540142671e5be/67285409430.pdfIn PDF document text
    • http://viewcs.com/partner/upload/dextfile/damejonevigid.pdfIn PDF document text
    • http://waelfawzy.com/userfiles/file/bixamewazojubugovu.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/f6eb20c067d884e78c2c1c7b64610b40/rewuzofat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=2d+call+of+duty+zombies+unblockedPDF 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_off0000e4c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C9 17720 bytes
SHA-256: e4068b2083abb7240165bfa637b8706bbb5f9dd948b64808b56c223187cb2a87
font_01_sfnt_off00011388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11388 11068 bytes
SHA-256: 2d83520caad88c19597d361a887dfe163a3d1c89b15f9943cf2220504e8207df
font_02_sfnt_off00012d73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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