Malicious PDF — malware analysis report

Static analysis result for SHA-256 064852f7e5081d90…

MALICIOUS

PDF

73.5 KB Created: 2021-09-19 13:04:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2bd8cbf5c2d9b5d99dad7c2bb9a314f6 SHA-1: 2534eb769faa73ca744a715af2d0225a4627d9f5 SHA-256: 064852f7e5081d90443e58b710babb513b60d507b73dec8e48fe18d29db64217
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting. While no scripts were explicitly extracted, the PDF format often utilizes JavaScript for malicious actions, hence the inclusion of T1059.007. The primary attack pattern is likely spearphishing via attachment, aiming to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://baocaosudanang24h.com/uploads/image/files/zarukexigejutaruramawodo.pdf In PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/kq9mc8hjotrbq8mels7vkkgm60/tizedirufategijebe.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/31786687336.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161447a8b1af2a.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/tiwaxotatejofoxifaladixi.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/zezatilex.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/barulobajapitowuj.pdfIn PDF document text
    • https://btegypt.com/file/widaradomupisujikunipivu.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/mexan.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/jotedesupoki.pdfIn PDF document text
    • https://gibidesign.com/fckfiles/file/30795908244.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/15210572340.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/sukivoresejofegegoz.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/91271fd56a44afe922ce56951b46ceeb/30985161499.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af54035014---ruweg.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/42028662502.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109130006319444.pdfIn PDF document text
    • http://flomojapan.com/upload/files/25056795195.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/4270268096.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/40161496722.pdfIn PDF document text
    • http://hmondo.com/userData/board/file/79870103394.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/51014798659.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/fuvupubokanisejabenanudi.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/d5c2e4a21a8cd708d57acaa030a232f1/20680195762.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=apke+avchetan+man+ki+shakti+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_off0000b6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A3 10756 bytes
SHA-256: d63dda87d05360421c941e466859591b27ae741b221ab1ef912ca79474a0f3d7
font_01_sfnt_off0000cf45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF45 18700 bytes
SHA-256: dc0c511627c45eca10ce061b32ded969dc1d444631d7ba35ecdd4a205915f778
font_02_sfnt_off00010003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10003 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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