Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb57970cf5bd63e2…

MALICIOUS

PDF

80.7 KB Created: 2021-06-29 16:11:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 818e038d56da907aa82516b436217db8 SHA-1: 652948bb3804469a51b7dae25add36c4098ef140 SHA-256: bb57970cf5bd63e2eb6192f4e7a02376732d42cd22c0e96207e9f2737d32bd5c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to lure users to unsafe destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://nomylo.ru/uplcv?utm_term=michaels+hairdressers+cockfosters
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858cd791da3---jitinokirixizutapusekofa.pdf
    • https://lesartsdansmonjardin.com/userfiles/file/20210522035627.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081b62698354---vowovudituduto.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/e4d07a4e942a25f588eb08523357c4da/wuweraxofajati.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/d8d65639f480b2b6dea1dd284f421f58/pisafis.pdf
    • http://llux.vn/uploads/files/27860889604.pdf
    • http://dyglas.com/userData/board/file/pojirosajido.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/62466549759e31c4dd380d71f1dc1020/94427242951.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16071d122beba4---rerodesanakotazom.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d496babbbd---migisomazuzijegosav.pdf
    • https://giorgiosantinelli.it/file/bagusoxuf.pdf
    • https://noihoithanhtuan.com/media/ftp/file/90683199386.pdf
    • http://files.ibiza-ferien.de/file/56018693470.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607214f1647b7---rinozevafiruremajo.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160c349e3d044c---tafusajik.pdf
    • http://porpora.info/imagenes/imagenes_contenidos///83512336989.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/71133fa13142cae9557a96067e094305/xibadejutolifanapumesasi.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/b2f66f5e4785277f75a88f307bb4f37b/dixov.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/6f6e0b5d637b65feb0bc51043208822f/77467728727.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca72c0910f---zavapezevonejitawesibe.pdf
    • https://tractorpulling-emmeloord.nl/upload/file/5475074780.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d53f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD53F 16792 bytes
font_01_sfnt_off0000ed56.bin
3e7dee66ac76019b41d4bbe473d56d7ec092712bdc70ff31063659e08ca75a87
pdf-font-stream PDF embedded font (sfnt) at offset 0xED56 10556 bytes
font_02_sfnt_off00010593.bin
ebcd67aa591fa1c8cc0798c5cf80972648d5672c533ee19005b5941d89b717fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x10593 17816 bytes