Malicious PDF — malware analysis report

Static analysis result for SHA-256 40ba3bc0be043aa9…

MALICIOUS

PDF

89.2 KB Created: 2021-07-20 18:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: fe0f73b04fd92e698186d79a99e1bfa9 SHA-1: a74958adfd9bbb4a345f593a5c9968cb3bb93a3a SHA-256: 40ba3bc0be043aa938a5ee40bc1089370bd92ade02d2db42040b277a0c9a77a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the final malicious destination. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript for malicious redirection, and the overall structure points towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/165a06b9930a77619f19fa759260d8d5/zutezeme.pdf In PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/3c174d9e743b98de9648299918d3a931/repanepitaluvife.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e9198d39329---pigodalulusux.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/tufizaratatirexamixip.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c76f4889117---xudado.pdfIn PDF document text
    • http://yilip.net/userData/board/file/gekonovagefivuwulepi.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/kufisiwuxizibusexi.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092e52ab6c59---48812109818.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a0896cac410---jolebajamap.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/8e30ce7551b54a119c5b006fd8538740/4530100760.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/49629121596.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/jokavusadibepenedod.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/54495274576.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7d95ef18a4---78401646597.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/zufeluxalasovog.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/69099459181.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/e06bc8d35976b97d1eeeed2db60573ff/sebutefad.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/96774126927.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c949b8a8f37---61031608416.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/5325536eb90aff408b842ddcf1761910/bilalafixox.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/09092be6fa0b0c7421505a2283d42def/72406787048.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/03a0f4c809ea636acb3765bf29e5ea8e/31760315601.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=essentialism+the+disciplined+pursuit+of+less+reviewPDF 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_off0000f749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF749 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5B 17144 bytes
SHA-256: b0f04f32eb93675a88b9f4272e272f1e6e1daf0bfea3bbacb2a71f010e141e08
font_02_sfnt_off00013ba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA4 11120 bytes
SHA-256: 180c67fd1fc5d9326790f199b0aa6da811deee18c81fc0753e577afdf265cf0d

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