Malicious PDF — malware analysis report

Static analysis result for SHA-256 2491a89aac582acd…

MALICIOUS

PDF

122.1 KB Created: 2021-06-26 05:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f82b588f2131224247242d719c571779 SHA-1: 74066ff064fd2e2d33a61c0b646dbd94b40ff6af SHA-256: 2491a89aac582acdf9ba383b0f59cd13d2b2a0d0e8f32a49e3a6cb597d9cf2f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, which are commonly used for phishing or distributing further malware. The presence of these links suggests an attempt to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9782

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://wastran.ru/uplcv?utm_term=no+merit+meaning
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c00073304fe---jizavajuziwetaludepo.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/3c44b67f2574b5aa16eacbf06cac420f/jidonajidalar.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/851e3192043f359d7acccbce2d7d62b5/99593391497.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/cc94fd1a7821993f45d6454092ab0daf/jupivu.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a149c23c376---vowusil.pdf
    • https://sitpchemcieszyn.pl/_sitpchem/file/kilofulinujifutod.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608cca6543871---tuwesilumubuluzomaduz.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d6847f50a85---6044456809.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077c8f91226f---kagal.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/6g1iul9tfrnuh53aqpf5mannu9/rojipolukixaguduzasodar.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ddb5d1420---kivexosu.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce52281fa9---xozuwamar.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084446ab3a17---vabagimajanusojuv.pdf
    • http://zonwering-belgie.com/ckfinder/userfiles/files/17164961009.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/mflohskjg2kduu85osbm195eub/wixijizesomupe.pdf
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/546cf56f012f4ae417aac5dec04d91ab/60755134985.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079494366a0c---95774247346.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/1a49d91eaec9c200653d6b9719edf9a7/20177932006.pdf
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/5edc78f369e8387b57f90265fbe75c32/xumedakap.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/3agi10vs9v08pr9uvhocjrjv73/konomukimejijenef.pdf
    • http://meble-tk.pl/userfiles/file/3561267179.pdf
    • http://fritz-fahrlaender.ch/download/78484548364.pdf
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00014a8e.bin
da87cb033d399f0ad96e2ff25766251bafdbaae19e73c7fccf7f91b8a952a8a5		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14A8E 25024 bytes
font_00_sfnt_off00011b9b.bin
1b32cfe26eb818159ebf8a41445a06beba2ae8b805af9d0cfaa702f886a0d065		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9B 10216 bytes
font_01_sfnt_off0001327d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1327D 16792 bytes
font_03_sfnt_off000178fe.bin
7accd6f355f578a17cdfc0d440be2efbdb1d068e794db0a65248c0dc239c9274		 pdf-font-stream PDF embedded font (sfnt) at offset 0x178FE 7816 bytes
font_04_sfnt_off000192a3.bin
48e7886ffeabca67d561a2d399b9a49c397b887316bd21955388f93671501f4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x192A3 30076 bytes

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