Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a89f28f65b6cdc0…

MALICIOUS

PDF

76.5 KB Created: 2021-09-03 13:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ee5d39952ee057729849aeefbe857a1a SHA-1: fe6274ca438ca31b9d8aae9adc1af31d9d585ba8 SHA-256: 4a89f28f65b6cdc01ac8508458f1190d1c2e1c9980d7c3b918f3033f1c43e1f5
164 Risk Score

Malware Insights

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

This PDF sample was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains an embedded JavaScript stream and a link farm pointing to compromised or disposable hosting, likely intended to redirect users to download further malicious payloads. The presence of JavaScript suggests an attempt to exploit vulnerabilities or execute code upon opening.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://aldo-ins.com/userfiles/file/vefafuxepivalubizusarup.pdf In PDF document text
    • http://atol-res.pl/uploads/file/6522972164.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/nusinitisiki.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608143dc48e59---budanu.pdfIn PDF document text
    • https://tepihtrava.rs//files/51184397475.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/gedomomatujokopitugap.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/b5c70efc46c31a27e0f0a6619d430b67/6733645424.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/718f5b0f7ef6eb200a87630e60cacd1c/97799380366.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab57b7b6c73---31642856486.pdfIn PDF document text
    • https://digireg.pl/upload/vililoginujajuxuxefilumo.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/davanuzag.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/figakemejorib.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/0e45ed9ce7c213d017516de9ffed4b7b/gitemolakutojixiliseg.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/miwikej.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/fidebonopotuduxox.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/65711013719.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/10510724872.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/vukafut.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/ff5067b21d9e776a9bc269a10b51c45b/9185249786.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/mm41k7os89qi62dei5jf4krbff/fiwusofabidetelelixeju.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af0fa19e8b---26469901960.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/ed10e6b0c145963f4c69fdca0663f47f/56372630683.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=election+commission+of+pakistan+jobs+2019+form+download+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A8 16872 bytes
SHA-256: 19299f2055c229c80d551684d5faec9ff79dab5331e5abb1df905f969661e01f
font_01_sfnt_off0000f075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF075 11672 bytes
SHA-256: 98c9f2dded2b0186ac6c75ce724137faa29435696f3c8f690937ea43512f7d4c
font_02_sfnt_off00010c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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