Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d5432f85e99f0e8…

MALICIOUS

PDF

82.8 KB Created: 2021-09-17 21:00:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8ed2adbf5eac8a0207dfeb201b96cfaf SHA-1: 130edcd2bbacde2a69c0c971a4c8bd05862c8d19 SHA-256: 9d5432f85e99f0e8537ad8c38eea0c98746a3b500eebd41f976a7c107f307544
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. The presence of embedded JavaScript and a large number of external links, many hosted on compromised WordPress sites, suggests this PDF is designed to redirect users to malicious or phishing websites. The 'utm_term' parameter in one of the URLs further supports a phishing or malicious campaign context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=nova+android+apk
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0dff5967c---kivexaxinivelanemev.pdf
    • http://agilesolutions.in/uploads/kagopup.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/ccaj8utslqrh5a4f6ofbea56lo/gegaj.pdf
    • http://fecirturizm.com/resimler/files/31832155209.pdf
    • https://campermagazine.tv/public/file/94155098733.pdf
    • https://xylemleads.com/userfiles/file/vanubosepaboxiletolov.pdf
    • https://path.mn/userfiles/files/vukawofub.pdf
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/marixarunukod.pdf
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/bozikinozuv.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/5ad2b64e85c0c89d52233793a4de9528/82685364869.pdf
    • http://sanfrancescovet.com/userfiles/files/kavutalenulax.pdf
    • http://wisdomtours.net/upload/file/6122414816.pdf
    • http://48bulls.com/js/upload/files/18687313309.pdf
    • https://n-v-v.dk/userfiles/file/60065017285.pdf
    • http://udokutscher.de/gfx/userfiles/files/rofodumekogigefo.pdf
    • http://placidlakes.com/larpm/uploads/file/zadevonapimetubi.pdf
    • http://zgkimsteszew.pl/img/upload/files/julojipolerurifekitat.pdf
    • http://area100impianti.it/userfiles/files/88075469700.pdf
    • http://csc010.com/userfiles/file/20210917161059_4kspzk.pdf
    • http://pro-group.ru/userfiles/file/tolusapegejumolubata.pdf
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/mexuzop.pdf
    • http://hanmih.com/userfiles/file/20210902033319.pdf
    • http://www.udelimpa.es/ckfinder/userfiles/files/153444177.pdf
    • http://safires.cz/ckfinder/userfiles/files/satilatufumax.pdf
    • https://foulardfotografando.it/file/8626603576.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_off0000dfac.bin
c32bd4e16996fafec18247a2acbda67f6182fde11a0d58236a059dbafa093a97		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAC 18348 bytes
font_01_sfnt_off00010efc.bin
6f6ecd82cf320351356c9df8e95eebf273f88f788acd92ef4b004b5b97eb3ab1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFC 10076 bytes
font_02_sfnt_off00012575.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12575 16792 bytes

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