Malicious PDF — malware analysis report

Static analysis result for SHA-256 53b8be4b4bbfe4df…

MALICIOUS

PDF

83.9 KB Created: 2021-07-09 02:24:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c61c89740d4b6fb600f5f3f6ae3e68d0 SHA-1: 763d33cb5cbb23f7ba8b8b3f20abe054428eff4d SHA-256: 53b8be4b4bbfe4dfd9a81d653d96a230801ac5a75acab36f8d2b07b6e315dbc7
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://wecans.net/_UploadFile/Images/file/durivujaperopele.pdf
    • http://st-ark.it/userfiles/files/17431808290.pdf
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a872a339e83---93716729814.pdf
    • http://bestpokeya.com/uploads/files/nobib.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/1nqoaqldqu90moaqjrlm83n4ri/jejakiribof.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/48ac16aa52786488ec513a2ea3a338d7/padajuzejapuvona.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769234b4bf7---titarafupanejapufizome.pdf
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/689c02d564d0987b71d64998f0de9d7c/nimutopomidoj.pdf
    • http://indovinandoilmondo.it/themes/userfiles//files/32591107819.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/846ae63b33dfcf9806235a030249094b/lobutufizaxebosuxokuge.pdf
    • http://cp-tournament.org/ckfinder/userfiles/files/samovitugitigazal.pdf
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/1f41a2efbfbb974e56217d47ef7fdc77/libameluvisezoz.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160899b23f1502---56547928656.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8b224552d---36985420717.pdf
    • https://service-panev.com/userfiles/36207545848.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/1f16e4efd83bd49ee8e2e62c30c7058b/ganaborix.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607acb85c65bd---jejonepozidosopekilureb.pdf
    • https://besteva.com/upload/files/84256319811.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/89fc1515881e1557eb5c8dea5692b0b8/62694681297.pdf
    • http://amajyuku.com/files/files/40134525518.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/olqtonuacr9c18gnjfmugiedgt/jazizudovatuxutijanine.pdf
    • http://apexibd.com/uploads/fck_uploads/file/7355359051.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b89de656546---11840103397.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=quotes+about+a+fool
    • 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_off0000e5ff.bin
cb5f991bfa1ab09f08d26875cf1a22e6d4687f34d5438c9e8b1ac9fe5bfac341
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FF 10212 bytes
font_01_sfnt_off0000fd37.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD37 16792 bytes
font_02_sfnt_off00011549.bin
7c82424ecb583327c6c2332bcd22e04bd5ce6c46bae5d8dbfb943e5a1c7f950e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11549 17372 bytes