Malicious PDF — malware analysis report

Static analysis result for SHA-256 af0065141bca7951…

MALICIOUS

PDF

71.7 KB Created: 2021-09-07 03:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a70f550cebfc3c3f4c50ff5cccb1997b SHA-1: 54eb13c5c8746a227cbb85b531778cdda4d7e060 SHA-256: af0065141bca79517363f856171011a24529f327c59df4be92ab89ddbba0b52e
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a pattern of using such sites for distribution. The embedded JavaScript likely facilitates the redirection to malicious sites, potentially for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://simondaulte.com/ckfinder/userfiles/files/xuwobunabesave.pdf
    • http://hasdeu.md/data/userfiles/files/44200121960.pdf
    • https://guclupin.com/calisma2/files/uploads/28811589595.pdf
    • https://avonsteel.com/UserFiles/file/44663323761.pdf
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/8687384035.pdf
    • http://unipsyclinic.com/userfiles/file/20210722134501.pdf
    • http://xn--m1age8bh.xn--p1ai/files/file/19917093520.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160985d1deec9a---58147289582.pdf
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/6d1oigi94lvper5od9dn64tbot/gozevitexox.pdf
    • http://landroverbh.com/ckfinder/userfiles/files/jobitajepale.pdf
    • http://vhs1962.com/clients/b/b9/b967f936f519796c2a696a6ed1da67f9/File/fagoditot.pdf
    • http://jianianhuayule.a9188.com/upload_files/art_files/files/20210830_122930.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ca61a814f---bozoj.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5937044c3d---57694065239.pdf
    • http://csc0731.com/userfiles/file/20210821150302_hwtezd.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd8e392ad5---nuforulizulok.pdf
    • http://paulsaperstein.com/userfiles/files/rerajo.pdf
    • http://atdawnwelift.com/userfiles/file/dufunidileroboziwogume.pdf
    • http://actinq.nl/upload/file/sefebopufetoxofudosow.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c06389a0b18---maxolubadezalupere.pdf
    • http://szwygs.com/upload/lozerewatufedipaxopor.pdf
    • https://almuhja.net/ckfinder/userfiles/files/80557830869.pdf
    • http://herfon-machinery.com/images/ckfinder/files/20210713041420.pdf
    • http://jaatkinson.com/userimages/25944956330.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/d1f53a323013c6e3bc24455edb8fa75a/gijodafesa.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/4f3ff217db3cd7ef613bf38c265f46aa/26244503869.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=pdf+converter+bot+telegram
    • https://mediacentre.aerlingus.com/js/ckfinder/userfiles/files/gipazidokufilo.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_off0000b97a.bin
5a67d63bd6248ab81076bb5460f3446ac57c180014630dbbd430eeed93e42e2a
pdf-font-stream PDF embedded font (sfnt) at offset 0xB97A 15200 bytes
font_01_sfnt_off0000e013.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE013 16792 bytes
font_02_sfnt_off0000f82a.bin
b334df010de99f2831ad4689667c79dbe2dbf293154b1b784e7c05687095e437
pdf-font-stream PDF embedded font (sfnt) at offset 0xF82A 10764 bytes