Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f0ad471a5d93f73…

MALICIOUS

PDF

102.5 KB Created: 2021-07-13 03:43:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3825ac72b020cc6025cb5bdaa90bf861 SHA-1: f0aa31aa3f99d2c6385b85ffb14304056bad2f85 SHA-256: 2f0ad471a5d93f73d4ca4647817c39ded362649f12aec7467fe17aeb24414baa
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9358

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://krisoc.ru/uplcv?utm_term=cytology+tamil+meaning
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/mf6f19qhima284sb6kji0nmt42/refavez.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/3dob8vkvarqtckm2eme938nog2/65714297457.pdf
    • http://robedecreateur.com/img/files/64864025800.pdf
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3ca5ce617---91001862662.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/474839f8cd3356187072036e7ea4b810/50174754864.pdf
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/nipufimobixupazi.pdf
    • https://oversaslogistica.it/file/jusabi.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7ccf054a1---46028263508.pdf
    • http://55pluscommunityspecialist.com/userfiles/files/13867095290.pdf
    • http://ateliergermain.net/sites/default/files/file/98616000017.pdf
    • http://lhs1965.com/clients/880801/File/levutu.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/a9a9b89fbaa689309478815f5a66230e/murojef.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b40076e10f8---tarugutudazoguwet.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd3245537b---88299513678.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b985c0eac42---wuramofepilokivadusod.pdf
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/963d40968281d421b9836e2ff283907c/41130983296.pdf
    • http://selfmadefilms.nl/userfiles/files/99101769360.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093fc9f7ab86---kuvebigigonen.pdf
    • http://beijingbeat.com/contents//files/59768848671.pdf
    • http://mg001.cn/upload_fck/file/2021-5-28/20210528102352821074.pdf
    • http://sllight.ru/design/img/upload/file/luxibatabiwenuv.pdf
    • http://cokhihoangvinh.com/uploads/userfiles/file/61378544494.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16093a265463d2---67992796363.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b100f343c---napomowulakatojux.pdf
    • http://jtour.vn/userfiles/file/fezifafikad.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/1168413527b9052034fa24e6f4ff4a4d/91257687838.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00012cfb.bin
d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12CFB 18328 bytes
font_00_sfnt_off0000ecc4.bin
b1de7abe25ad5d7ffc40cbc47ef0674e1d43b96a6fd02eb9b1008a2c29ea8909
pdf-font-stream PDF embedded font (sfnt) at offset 0xECC4 4684 bytes
font_01_sfnt_off0000fd9a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9A 16792 bytes
font_02_sfnt_off000115b1.bin
81f75f577becbbbba9f69180244ea145246429677c704ab614834fac427705cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x115B1 10328 bytes
font_04_sfnt_off00014a98.bin
8e3fc3a5659bf8cffb86988d11392349b0883276d7a6c1c9ac478482158d37a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A98 26780 bytes