Malicious PDF — malware analysis report

Static analysis result for SHA-256 e00a4996a23a9d0c…

MALICIOUS

PDF

80.7 KB Created: 2021-09-17 07:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ed129c59207f48680040e361aa72b2a SHA-1: a8b1d2c32201ed4f1c77a6031d8bde7a709a8ac7 SHA-256: e00a4996a23a9d0c8508b203bee68c944a2f0eab26edb69601605c9a80efd1c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. These links likely serve to host or redirect to malicious payloads, attempting to trick users into downloading them.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://studiodugnani.it/userfiles/files/molik.pdf
    • http://md-servicios.com/userfiles/file/60891896879.pdf
    • https://betalinktech.com/blmedia/file/97785526800.pdf
    • http://playonathletics.com/userfiles/file/75003659905.pdf
    • https://uzunlarpeynir.com/dursun/upload/files/22031313180.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b348c4ae2d---6319117502.pdf
    • http://laiyi-art.com/userfiles/file/16097274168.pdf
    • https://jordan.si/dokumenti/file/viwototidokujeri.pdf
    • http://www.premiumimport.nl/ckfinder/userfiles/files/31361340862.pdf
    • https://pinkrali.com/calisma2/files/uploads/63665897598.pdf
    • http://studiotipaldo.com/userfiles/files/piguxejowes.pdf
    • http://tvoirostov.ru/ckfinder/userfiles/files/8278131527.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/np3lmah1dqmobl6titokkq25k2/96213963436.pdf
    • https://clubon.top/uploads/files/48741804195.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/ca021e31a5852f21d174b7fc642d6ef4/75511242727.pdf
    • http://savages.lu/imagesRTE/files/757478475.pdf
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/vajaxozeluwetexulezudoda.pdf
    • http://a-aqua.fr/ressource/site-image/files/gufukesetubom.pdf
    • http://vankouwenenmastop.nl/UserFiles/file/lejepukixolavepavo.pdf
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021091309552080554.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=u+dictionary+apk+download+old+version
    • 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_off0000d643.bin
4905a75ea951c269eda853aa5b0d083f1f31ded5b307a8c2be702119fa081d47		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD643 10872 bytes
font_01_sfnt_off0000ef9d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9D 16792 bytes
font_02_sfnt_off000107af.bin
be82df5713cadc61b6988524d85383b7b2de1aa6d60cc14eb121502373d69656		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107AF 17124 bytes

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