Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f167c719baf30cd…

MALICIOUS

PDF

92.0 KB Created: 2021-07-26 10:44:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a02dd722d359b53b72cf7a60175227f7 SHA-1: 52e98de6f39b0de1b17fe361bb88f868ad9d9568 SHA-256: 8f167c719baf30cd1185b8ce73adbe0d78a28d36b7048663ba4118687be3ce51
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress sites, a common tactic for distributing malicious payloads. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download an archive, providing a password to bypass security scans. While no scripts were directly extracted, the presence of PDF link farms and the ML classifier's high confidence score suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://bursakaynak.com/userfiles/file/kalot.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/vnt99qd5rt9vkgvivb6bsuu64e/76954275480.pdf
    • http://mobilni-kadernictvi.cz/files/file/muzigizukugip.pdf
    • https://atlastoursntravels.com/userfiles/file/taneribamomisabavopalu.pdf
    • http://vervesimuhub.com/userfiles/file/giwukita.pdf
    • https://kildevangen.dk/files/xafosujitelupujejemuj.pdf
    • http://zabradli-znerezu.cz/userfiles/file/mukesulezozugitasinozulog.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/9dda0fe86a7f46947cf475e5d762fa23/kodomapidepumijifexalojuj.pdf
    • http://agro-pasz.pl/ckfinder/userfiles/files/xizugaboxezupituvivomajun.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9f5ecc1f1---96100586315.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/609bd9ead3a7570bac5655deb0a06ec1/59536559932.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160dd975fba7a6---jarurov.pdf
    • http://asijskepotraviny.cz/files/file/miziredijatapolulazedagu.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160abab7f44544---20560963459.pdf
    • http://espacioschillout.es/images/admin/file/xagor.pdf
    • http://stacjaregeneracja.pl/userfiles/file/2933685533.pdf
    • http://wu-pao.com/upfiles/editor/files/wenod.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c457cb86926---86047294721.pdf
    • http://abwninemile.com/uploads/files/19715131546.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c4b8b3275---81291702377.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/9pdo4m91hasoahlhq1a32c4hvp/73501424747.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/ff82c79cc30c116fc7dc0f1c14c27967/momolulawuzonivege.pdf
    • https://maggies-handmade.com/UserFiles/files/11545286280.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=clash+royale+descargar+para+pc+windows+7+gratis
    • 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_off0000fd1e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1E 16792 bytes
font_01_sfnt_off00011535.bin
36225a9a3c12a90660e84c887f9f3dd51aa2fd4a732e104d7c435fbe9358417e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11535 11076 bytes
font_02_sfnt_off00012ee3.bin
f4c3c5ea602ff33a2c9a4726342e74a5106d882dd28980a1e7e6cd7a693abf28
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE3 20076 bytes