Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4aeb52ef1866f8c…

MALICIOUS

PDF

91.4 KB Created: 2021-07-23 12:29:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 48183bba6421369311c8d5756f90d7b6 SHA-1: d1d43b49f8f0426699e7f259dbda2e933f2ff06c SHA-256: a4aeb52ef1866f8c6a17c9e0e2806f73b14896db53ebaa6eac3f2819a138c912
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. No scripts were extracted, but the presence of numerous external links indicates a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/p7p96j2vu5r2spqlgoi1i77k64/xowajavizadavinaxuvufapik.pdf In PDF document text
    • http://adamlegal.com/userfiles/file/paxiwuk.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073c3b785bfa---91677891659.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/mazebufivipofelil.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/fewinesexufi.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/81dc9eefe7e3a37ada0596961219948e/pazaguzitofemififenegejal.pdfIn PDF document text
    • http://phongkhamducphuc.net/images/files/faruxo.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/ef56066c8b50b2818cd714aebd248fd8/famoraxunuvidopego.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/63621124312.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/aa96f0c5abbc9e9da861f02d650cc3c7/wezafevajex.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/61734320350.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/717bac5f023ffef7a941ab5691b27094/32774181200.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/wojijusudil.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/8418995687.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/8399727510.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a37c4b45441---36615141620.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/voxape.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/lolanilipipupubu.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a613f494ec8---9243649725.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d32b32ebd4b---28899876696.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6431b8bcbf---67860777978.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/9999080841.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a67c30483c9---23630667012.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/lenuralelix.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/3d7eced5621fd4958c38e3d67c2bc62d/xezevapoxeriduzitez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=dysgraphia+is+related+toPDF 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_off0001030a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030A 10684 bytes
SHA-256: a9ec79333df53eb9a940d3dd2721c6313e535011c1ebb118a985f3b0b45ae852
font_01_sfnt_off00011b75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13387 16816 bytes
SHA-256: 35891f0323ece3c50b44ab61d3959d708550a0f5b876e6f0684b46794275725e