Malicious PDF — malware analysis report

Static analysis result for SHA-256 24e253ffa334e3a9…

MALICIOUS

PDF

96.2 KB Created: 2021-07-01 11:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 56477c4464e4273f95058f0c1f4c0e61 SHA-1: 23c375610a34803a560365efe4f7256c1b07e896 SHA-256: 24e253ffa334e3a96e98e65520cf3308d076bef154cb1aacc574f1a8ddbdc9c4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://eotp.info/sites/default/files/fck/file/73330121583.pdf
    • https://raiporjai.com/piceditor/file/92264241448.pdf
    • https://npkfertilizerproduction.com/d/files/zuzanimabuvonexuwelavu.pdf
    • http://www.annaleehuber.com/content_files/file/89861927360.pdf
    • http://qiuyutv.com/userfiles/files/20210609125212.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/d43b0a0b2c58e19520a94aaf5b882f27/bazikavum.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160abff0aa7638---97964416371.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160707cf87d3e6---fupewatilezixabasefomikoj.pdf
    • http://brightwayconsultancyservices.com/userfiles/file/99913865229.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/h9q454juec0jj672n7vdbg5dqk/71347924011.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/5a2c9f5a0cc2a45f6682dfd0ef44cda5/puluminizekawoli.pdf
    • http://vantaibactrungnam.vn/upload/files/39443998611.pdf
    • http://pnmanagementsolutions.in/uploads/9465788741.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/fddpd4nm0ac5ko3adbjle0sqc6/jefoje.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb67f20e6b---nakikoxa.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/tqf5r8n2db7hjt0u9r7m89252h/89940108694.pdf
    • http://www.pranabkumar.com/fckimages/file/gatusimiroz.pdf
    • https://sportsht.com/userfiles/file/defowubumeg.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1fb46be35f---sogeganiloniv.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/b5ed1d342d90e3469d44ad267b5c0aa1/94284185007.pdf
    • http://www.europesolidaire.eu/userfiles/files/gadimelugube.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16089c36185e1d---47876234787.pdf
    • http://jrpst.pl/userfiles/file/11933178592.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=earthbound+snes+rom
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010220.bin
4fae7ea5581155bbaebd6eb25f12138d5ef1a36a492ae387e766b0907864ae5a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10220 4216 bytes
font_01_sfnt_off00011282.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11282 16792 bytes
font_02_sfnt_off00012a94.bin
7f0cfd369283f92a088da20c78c0a6c311756b4b8b1697beebf51bb306c8bb47
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A94 18376 bytes
font_03_sfnt_off00015983.bin
c42f6e903075e6623ee270908a537d6aca58059a97cc8763e2aaf50cc3a3f87f
pdf-font-stream PDF embedded font (sfnt) at offset 0x15983 10596 bytes