Malicious PDF — malware analysis report

Static analysis result for SHA-256 37a55c2ce1514adb…

MALICIOUS

PDF

70.4 KB Created: 2021-09-06 14:13:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 83901eaf1f9bd3c6d8c2f18018cbabb1 SHA-1: d82b903d135509a25664a2c719ae511b98a27697 SHA-256: 37a55c2ce1514adb8981cf85147086a7fd56362038566546af89d8ac870e8ea1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many pointing to compromised websites or disposable hosting, suggesting a phishing or credential harvesting campaign. The embedded JavaScript likely serves to redirect the user or download additional malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=lycoming+o-320-e2a+overhaul+manual
    • https://profesa.net/userFilesfile/70793868664.pdf
    • https://birotex.rs/images/files/xidagamulexovuta.pdf
    • http://paradisoseminatrici.it/userfiles/files/31633772639.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/545be22304167c632f6cd406b49e728c/xulevuwanos.pdf
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/nikuxadozabalisuzi.pdf
    • https://allcreaturesinc.com/files/files/60919507701.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/uft5j5k36nc5fplj0l9dp46etk/wajujigeweg.pdf
    • http://dhf-china.com/d/files/14118399745.pdf
    • https://gastriklandsbf.se/UserFiles/files/96523862867.pdf
    • http://titibbs.xyz/js/ckfinder/userfiles/files/gepewuladugid.pdf
    • http://lafenicealcamo.it/userfiles/files/61616885592.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/ab0e058bda58437aaaa36fdf9b57e39c/xizorekufipezazomexasag.pdf
    • http://akinmedikal.com/uploads/file/mamavavurutidazanajin.pdf
    • http://innersolutions-uk.com/file/62328112195.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/1585b87902276f2c950af28fc7096459/19586140159.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/74efc4c0c733d55c3349bf4e052582fd/24418955614.pdf
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/19896372793.pdf
    • http://massageindex.nl/images/uploads/36208676730.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16123bab978f02---tinifeva.pdf
    • https://fertilizergranulatorprice.com/d/files/wujob.pdf
    • http://cesnek-vysocina.cz/UserFiles/File/lizapafukeroran.pdf
    • http://firegallery.ru/img/upload/dovadufadav.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_off0000b12d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB12D 16792 bytes
font_01_sfnt_off0000c944.bin
231086b8bc791e9249b1907c13b24c26cc5f4086cb37eb6658cf67b94c75dbd9
pdf-font-stream PDF embedded font (sfnt) at offset 0xC944 11096 bytes
font_02_sfnt_off0000e309.bin
21a0a54b096dfe99d9aaa45c64590eee7bdfacdfdbd6f729a736a7a20530e5e6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE309 16072 bytes