Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dff47bdaa14b785…

MALICIOUS

PDF

83.5 KB Created: 2021-06-27 18:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 523fbefae573c6bb8a5a2db6c2efc68a SHA-1: f0b5093b1d00e56e75a3a6bdb92cb672aa362e74 SHA-256: 5dff47bdaa14b785cf05bd0e7359625cf83f4c7f760d2dd51859464b729887bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories, likely intended to redirect users to malicious content or download further payloads. The presence of multiple links on disposable hosting and the use of UTM parameters suggest an attempt to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/17aa06a57ce94293e8d02f9cfb3d6eba/setegifurozowugesejuwifup.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/1a39ac79c67a2cb7747b99942e4981af/76184053928.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/0b2ef2785c84e7cc3d6a6b56820f2a5f/74427834946.pdf
    • http://mai-colle.jp/userfiles/file/suvuponagile.pdf
    • https://pharma-tools.eu/galeria/file/gitomo.pdf
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/13j2urslsnenh947ospkmdq20a/jowezutofuwopedudobigijek.pdf
    • https://ubranni.com/uploader/files/81070360835.pdf
    • http://kyanite.tv/userfiles/file/5218826311.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/80113747042.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/b9ea624fded3cd35cae6f3190072fff3/40310582201.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/4ef98103cec0030e9b4429197ada975d/84112350576.pdf
    • https://cvsc.co/userfiles/file/97713679364.pdf
    • https://nnkcreations.com/userfiles/file/pusosirorumivulitoboti.pdf
    • https://bilalyapidekorasyon.com/userfiles/file/2980586508.pdf
    • http://bizbecho.com/pa/trainstation/uploads/image/file/zemijevulutedanufaloj.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/9qgmd7u04aa4upttts627egudv/bilotugunemekalirogefume.pdf
    • http://teresachild.com/upload/files/95162639475.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/thkj64g04n4aen0hm811bopbt7/24808820385.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731dbe4ccd7---57849382725.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/f29b3775d89e89dcd396e2b2383792b4/nomulitetozaza.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddbfc8a7f4---50635434685.pdf
    • http://domusanna.it/userfiles/files/4344852540.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/726a39e7c278aea39601e7cde568e78d/53745144744.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/c6tihat37pltiu5o673qq0pr58/43271864779.pdf
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/813608461.pdf
    • http://kwong-cheong.com/userfiles/nelosewowikepimiberu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=acls+post+test
    • 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_off0000e413.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE413 16792 bytes
font_01_sfnt_off0000fc29.bin
514d63bda8d94542e775aacab1b98e50d1ba069dbb7fb2ceddff25ebdab50c6f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC29 9892 bytes
font_02_sfnt_off00011225.bin
66552ee7510fc4c9fb13523d25559c5acb0e152aa2a7fb8919ea32f3cdc99b7f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11225 17852 bytes