Malicious PDF — malware analysis report

Static analysis result for SHA-256 240d5e1fdaff5698…

MALICIOUS

PDF

83.3 KB Created: 2021-08-31 07:30:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 34b27c58ab3ff0a73e1337b63d9e7a43 SHA-1: 7e0155eaa6f0e3004812e76d61d0f1d812c054c9 SHA-256: 240d5e1fdaff5698842bf926f914ab7dd4ab519db44f958124160830444a35cb
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. The primary attack pattern involves directing users to external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=first+aid+crossword+puzzle+answer+key PDF link annotation
    • http://alemotta.com/resources/original/file/fegajarabavagojamokomak.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/57135286604.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084af0b05e9b---34216555151.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/0b4c4f77e42683ea4ee047d71b7a4f0a/75142054475.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c07fc5853df---90747305849.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210713234703_zsingg.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/71122568579.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16095bf9898a3f---dedemejamisen.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/gaxibasosexet.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/jifojadopexopamuvug.pdfIn PDF document text
    • http://auchli-appenzeller.ch/userfiles/files/31430595893.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/7d6300c1f5132452ade2e20ec23c320c/ramuf.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/41584339899.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/zarejofukatewugepazakel.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/f8328706cbfba9b3bff8bb489138034b/nijutoxuzuvuzefed.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/bawawiranekalebeduvex.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/nibogunizonej.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/b4c105fc5b3c203da5250260e386b816/81761604394.pdfIn PDF document text
    • http://yilip.net/userData/board/file/95553724903.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/puwow.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4321a84f5a---27125649455.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/1c3099a2e83aa3ace40102678fdb5fff/35973119689.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/25182310461.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906a49a2ff9---65992702144.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4D 18632 bytes
SHA-256: 588f5edee6cea81555b484921e2ef4be26eb70b01806069805fe4e98be5729ce
font_01_sfnt_off00010d82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D82 10936 bytes
SHA-256: e91ac95c8370a67a0227e48048ff441d3e3b076ff8d888c2e1cd0471b150deeb
font_02_sfnt_off0001271c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1271C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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