Malicious PDF — malware analysis report

Static analysis result for SHA-256 28944d92f48987c2…

MALICIOUS

PDF

82.1 KB Created: 2021-09-15 13:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7e83875846aa9bb67270eff97600fafb SHA-1: 7f03f1a89ceeeba6bd677aa8a49c0c290395c495 SHA-256: 28944d92f48987c2cab664b5da2d38c91de1ce9eeaa5b992a1a85aafecf7db61
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which are associated with link farms and potentially compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pistant.ru/uplcv?utm_term=temple+run+game+online PDF link annotation
    • https://afra24.com/basefile/afra24/files/94307076532.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/91824758386.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/93883767299.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161380a2e95263---batakab.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/gekekeniwanetibixanad.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/16189770834.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/23028981412.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/tikilabigodotulepob.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/23606185041.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/wuvojawemajuduxolifevazig.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73839552996.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ce9134a0aa1295a09acb03a5df642dc9/lusifopafoxetuduxa.pdfIn PDF document text
    • http://sozopolihills.com/userfiles/file/45952059699.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/tojaxukutonuxejawiwoza.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/jajunol.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366c11f2fe8---19965673767.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/65245937644.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/69299025219.pdfIn PDF document text
    • https://mobisteelegypt.net/userfiles/file/10275923443.pdfIn PDF document text
    • http://tolltisztitas.eu/userfiles/files/35245991428.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/tabuzigadopasesav.pdfIn PDF document text
    • https://nitdgp.ac.in/uploads/userfiles/files/78527305758.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/79346d0052e51f7f825f52866278cbab/diwasutusiponativofet.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/pebixadopepibaxepobe.pdfIn PDF document text
    • https://www.posluh.hr/ckfinder/userfiles/files/13193256633.pdfIn PDF document text
    • 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_off0000dc8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A1 18120 bytes
SHA-256: 2c5fda653f208468cebfad5fb0ab7459dcad101233f54a55d5b94f152e0173ab
font_02_sfnt_off00012352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12352 10392 bytes
SHA-256: 7a3c562334243cb1a5ceac9693ac614ab5c07d673d0f221d59b654b70d8d4b14

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