Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7cb55acade69051…

MALICIOUS

PDF

83.9 KB Created: 2021-09-05 23:01:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 397548181fd7d1625c61db403b4efff7 SHA-1: fecbea157f903428cc770677371ef118a9041575 SHA-256: c7cb55acade690510079963f63905ec3d54ee3870d6383577a182cd730201cba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or exploitation.

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://pixomot.ru/uplcv?utm_term=curse+of+strahd+player+maps+pdf PDF link annotation
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/b5e87ee6109c61b58a02c62bc967f62d/jitozav.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/pugipemutulosiluwebew.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/72913263276.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a116ca8ca70---gesawe.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/97358326943.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/53513921260.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/wowovowefa.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f84718c7ed---50316246232.pdfIn PDF document text
    • https://ahha.az/userfiles/file/20517815975.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/1357063365.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/29000863063.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/gesovunexinukudo.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/161132dae361b4---40360703312.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1254a80f2---nedefovanatexojofovimep.pdfIn PDF document text
    • https://suksesunited.com/contents//files/loxiwifasapakir.pdfIn PDF document text
    • https://soechi.id/userfiles/file/69012634803.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fd53f881dfd---rasatepowurimoso.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/zoxafiwosulokigusupog.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160fc0cf24bb68---wudimitebug.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/58111444442.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/61036597552.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/ecae36595297f9164527addc92fc1958/xupunazuwiwudoxirusaxo.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0887bf9ab6ee563762e88e5d9c7ef314/rodelurafidekagezovu.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/86856719695.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_off0000e37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37D 10812 bytes
SHA-256: f47069fad05685dde98513b219eed6be6d095d2e5d1f507a0a7868650fb34c61
font_01_sfnt_off0000fc87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC87 17448 bytes
SHA-256: 22d66f1074550c378f5636cbddb5e0efc1ea44c7d00283b23cd26d1de910b280
font_02_sfnt_off0001298f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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