Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6a8fd29c141ff9a…

MALICIOUS

PDF

69.9 KB Created: 2021-09-30 11:33:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 41853ba1e787666a5991e19e165f3df2 SHA-1: 7b1bf65256d9b53dafe3532a2231f46dc609811d SHA-256: c6a8fd29c141ff9a38218232e01fa9472029ad1cec2617034975003af1aaa11a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to PDF files hosted on compromised websites, suggesting a phishing or malware distribution scheme. The document body is unreadable, but the heuristics indicate a deliberate attempt to obscure the malicious nature by using link farms on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://pistant.ru/uplcv?utm_term=truck+simulator+eastern+road+apk+obb+download PDF link annotation
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1615572149263c---vonerabux.pdfIn PDF document text
    • http://dalaichau.com/files/pojamixifuwufurebarevuga.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16150c0ffecb0d---46224495170.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/gawakik.pdfIn PDF document text
    • http://mertlakustika.cz/images/pages/file/12468930037.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/nixuxetekunipade.pdfIn PDF document text
    • https://ysh.my/userfiles/file/pavunobibowolik.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/70687265249.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/weveripajumu.pdfIn PDF document text
    • http://tourgrodno.by/images/content/file/kefipejuzomilipoxowowu.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/52949186652.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/21327750461.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/f22db636921494d3b3adf0b7fe464706/limixo.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/sidarixuwogojenifu.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/54881005486.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/52009643422.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/lapop.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/70525264949.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210913_B3F80CA3F297F03A.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/vikubediroxobab.pdfIn PDF document text
    • https://kiofruits.com/admin/uploads/files/96372118141.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/6943024442.pdfIn PDF document text
    • 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_off0000b060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB060 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC877 11056 bytes
SHA-256: cf4075761e49b0ce7e7410ef5906093a2fa0a8ba04ea5dfab8170f19cccfae40
font_02_sfnt_off0000e20a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20A 15616 bytes
SHA-256: c891630ef4856ea379fbf67c9b5f073eb2b8564032978c16ba46b0c183f21b36