Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e37b63fd4524b19…

MALICIOUS

PDF

66.4 KB Created: 2021-06-24 09:52:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 65d672a62c6fd212ade6f243c016cba6 SHA-1: 947c87dc786f29a37301681d302c533a7f6662a1 SHA-256: 5e37b63fd4524b19ec6e192c924fdb9b8549147b3f974cfa0062f43d874c6e4b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many hosted on compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://queure.ru/uplcv?utm_term=we+build+a+snowman
    • https://avgdesign.com/userfiles/file/lebono.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16095036454201---nijegiles.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/5253cf84040d6f34e8cf7a188d172f58/54095066243.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/c5e416b3b6058def88f22472cad8b847/depubuwexoruzagiditokaset.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a35c56bcfa8---xiwozatika.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/898efb5911a40c9a45d667bbd6e3b18a/93452069087.pdf
    • http://pagyesa.org/userfiles/file/20210619075416.pdf
    • https://girilawfirm.com/content_files/files/32208276049.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b07e809f2fd---19072173894.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081bc4e57ca3---87384247095.pdf
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/226931a6965a37bf4a9e53d2101b6382/revaxezimog.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607487c0af60a---87414453866.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/af3306dc386bf4a13ffcd799fc3c8a21/zilabazodibalunesaju.pdf
    • http://kassa.pl/userfiles/file/sifaxovedejukipekuk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c90f.bin
57e4b002b81e307ee8b50ec3872a498d60d5865ad263d99aeadfe72613e26c5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC90F 5120 bytes
font_01_sfnt_off0000da79.bin
d091e433937ae53fcb7d0611a4af2212e8d554b67327a337fb2b401bb166eb79		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA79 10168 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.