Malicious PDF — malware analysis report

Static analysis result for SHA-256 de0e19d47f3a82d6…

MALICIOUS

PDF

88.5 KB Created: 2021-09-20 09:19:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e5a7f8d494d08ef4e69d925f2bec273a SHA-1: 223a7afab03de37aebb709dcbc342aa7b6e0f4a2 SHA-256: de0e19d47f3a82d67fb7a5a40366caab47d23e9c7303aa205d863d6f9c7daab5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm on disposable hosting, likely to trick users into downloading further malicious content. The presence of multiple embedded URLs pointing to potentially compromised CMS upload directories reinforces this phishing and malware delivery pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ooobelkom.ru/ckfinder/userfiles/files/83267382640.pdf In PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/lawoxuxi.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/pidemizot.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/55344900779.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/xuvagonumojudarejewaje.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/fedeme.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/nuwibiguzafibalife.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/65438487178.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/jizapefutuwakofuberaxazun.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613016d4d8138---fanoziwi.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1630664745195741255.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/1830370789.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/87281167674.pdfIn PDF document text
    • http://actinq.nl/upload/file/patoxopemanasat.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/hddu1idode85i73she17se7op6/nezuna.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/161435131d5171---40034897532.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/safolemomixixuxozajezavun.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/50252697908.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/risufotolib.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/tudifetotakerajezakezun.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/nebewamedapixuguranejef.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/47802696723.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=elder+sign+apkPDF 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_off0000f4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCF 18960 bytes
SHA-256: ec4697568af1248e14f00ea79352071d654efb693c41708361408e37b906d133
font_02_sfnt_off00013d7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D7C 10424 bytes
SHA-256: a028b0988a40f52e6ada95726384dae41fa3810e3d34a77d90a4764ec4ddde07

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