Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc77ffb0c8fd53df…

MALICIOUS

PDF

84.3 KB Created: 2021-09-04 01:32:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b0ec49c7a65659cf15b4cb68f645fcc7 SHA-1: 8a141b62b208827fcd04f3ba4a8c80cbff0fa43a SHA-256: bc77ffb0c8fd53df2f2246d5c5731a51f286ec74896a097208e765d8714ba560
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate this PDF is likely used as a lure to direct users to malicious sites, potentially for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://garglob.ru/uplcv?utm_term=english+letter+writing+pdf+download
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ecaadbd4951---46953178321.pdf
    • https://casalindasbakery.com/ckfinder/userfiles/files/92824041049.pdf
    • https://kidneystonetreatment.in/userfiles/files/gogabegulewob.pdf
    • https://maviet.vn/upload/files/61305881076.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160841a9280b8c---93061058434.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/g6cqpehod1fp8ilhlkpvsu8f81/48085758972.pdf
    • http://savemaxint.com/files/file/7006022045.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ba30ce68a---75837307424.pdf
    • http://carmakers.cz/userfiles/files/29807510600.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094376b75bc0---bekusag.pdf
    • http://unsersohn.ch/images/file/posopazozowevabufuw.pdf
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/69468838182.pdf
    • http://tochalco.com/uploads/files/65418458222.pdf
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/bca99c73a9456926eab055657cacece9/10427263644.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/e4h7o5spvbr5132jbpanag028i/90831834527.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160783b5b9429a---32505008401.pdf
    • https://vcubusinesssolutions.com/userfiles/file/1188232200.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1afd8e9a9---77767059047.pdf
    • http://matthewsmillsreunion.com/clients/c/c7/c7863f7b93cb17915b2a89d887155530/File/6375899889.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160720ada2ade7---nibixapinonawaranilij.pdf
    • https://jordanadams.com/ckfinder/userfiles/files/16682561183.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/oqmnrhoudif2uulmi7qp7l9tes/vemuwibufikipuxejusoga.pdf
    • http://briquettemachinery.com/d/files/tubuvijivarodipugopowaj.pdf
    • http://kolaykanal.com/userfiles/files/gemiripuvuwitonamune.pdf
    • http://hasyo.net/files/file/80244811230.pdf
    • http://pivotal-technologies.com/userfiles/file/41592732266.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e52e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE52E 16792 bytes
font_01_sfnt_off0000fd40.bin
172f321785c45af330794679fdcb7e90795113b9fa4b1f7a292a157b0df25e35
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD40 17348 bytes
font_02_sfnt_off00012a37.bin
f0211f88a68fa3aaa3d050316799d80516a2c404e73957eee58ae56fcb4858c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A37 10848 bytes