Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4e31dc935483997…

MALICIOUS

PDF

71.1 KB Created: 2021-09-27 16:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b4758ca8699adeafd5d601b8cbdd2f47 SHA-1: b577c67557e3473016620213bcf2aeada56398a7 SHA-256: e4e31dc93548399740a811c9810a575be85718e658057794b52b10b7e6354690
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The embedded JavaScript is likely used to redirect the user to malicious sites, potentially for phishing or to download further malware. The presence of multiple links on disposable hosting and compromised upload directories indicates a deliberate attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/d0340ccf8938a9eb149b7e79b2834dc6/78558274898.pdf
    • http://manpukulivermore.com/uploads/files/fiwamewoj.pdf
    • http://crisismobile.com/ckfinder/userfiles/files/dazolaxegido.pdf
    • http://eros-arena-reutlingen.de/eros/userfiles/file/79384575640.pdf
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/nisezupegojaw.pdf
    • http://mirai-kankyo.com/userfiles/files/27256777950.pdf
    • http://www.pvvc.cz/files/sejenelixizidug.pdf
    • http://abwninemile.com/uploads/files/68435353582.pdf
    • http://potlista.com/file/files/19257218584.pdf
    • http://plantessentialoil.com/upload/files/tapirokufakuko.pdf
    • https://rhuyscampingcar.fr/images/files/gapapivup.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/3d5730209564d2ddf279fd775c0f076c/88255109601.pdf
    • https://cubic.is/userfiles/file/xofotate.pdf
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/xulazerovakatakunorawom.pdf
    • https://sbsoftware.ro/admin/userfiles/file/nedujukewolejut.pdf
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/bidosigobibabedapaxupob.pdf
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/31261087092.pdf
    • http://yds-wcv.jp/free_images/files/86764976636.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/6fa137a2fd61c74238993dcf5ea6160a/41442479962.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/bc0d202055ce15f24576ddafade397d7/bedewepofofokikekumuparoz.pdf
    • http://icltindia.in/userfiles/file/9539291047.pdf
    • http://seibyou-koujien.com/files/files/93254802251.pdf
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/sigofixifukifufovu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=audio+video+converter+pro+apk
    • 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_off0000b3e7.bin
a5d6f2704dd65d8864cc948a755f2490805aec4098bb40051020046ff2081b67
pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E7 16892 bytes
font_01_sfnt_off0000de8f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8F 16792 bytes
font_02_sfnt_off0000f6a6.bin
9182b98997b1bdd0e291ba4df771f060541b9f241602bf8c1d25486f347cb2f0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A6 10532 bytes