Malicious PDF — malware analysis report

Static analysis result for SHA-256 6edc9f8046460f82…

MALICIOUS

PDF

101.0 KB Created: 2021-08-14 15:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c459eba42ebacc1ffa3c678229465fef SHA-1: 36ea1e5679a75e2bbb9a486f8b31c4a3725e5220 SHA-256: 6edc9f8046460f82d6a4865e7f0037792ea9e5d82739d5a11375ba9bb23b3cd6
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to multiple domains, some of which are associated with compromised CMS uploads or disposable hosting. These links likely serve as lures for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://langeline.com/ckeditor/upload/files/gudubolu.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be942046bf3---jevafojulaj.pdf
    • https://xn--nmqu14inmf.com/upload/files/gabamateto.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c1151288841---40724191191.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/230e52ee52ccbeb8ccb388ed6e29edb1/zonuda.pdf
    • https://thietbidiensino.vn/media/ftp/file/nudasop.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a69fef89b3a---63767012707.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8454262d1---52050720406.pdf
    • http://bocghebinhduong.com/media/ftp/file/dufojema.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097554564064---tutebubokedel.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b49442f14d---xiludijojiras.pdf
    • https://porterbrothersltd.com/app/webroot/uploads/78725650916.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4888c27de---59428181828.pdf
    • http://isvpro.com/custom/files/xipiwed.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=tecnicas+e+instrumentos+de+recoleccion+de+datos+pdf+segun+autores
    • 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_off00012511.bin
7a2ca8260d5403a62d340c18be12d1b7b6b3987b2d4016753da39058bb0e282e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12511 11024 bytes
font_01_sfnt_off00013e81.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13E81 16792 bytes
font_02_sfnt_off00015693.bin
1d1881974c80cf4f9ce2323a7034d7319e072fad9c2c056c5e16801e12ea51cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15693 17960 bytes

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