Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6c52dd0e2807287…

MALICIOUS

PDF

81.5 KB Created: 2021-07-07 05:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b1e3805ab00de34c3df863b6f4caba5a SHA-1: d476eddd17e1770eac7936e2fa6f0af2d75bdf1f SHA-256: f6c52dd0e2807287a6fd78e2cbb64895b3ddffb1b2bffca3fab69192f7694d0a
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 phishing or trojan distribution attempt. The document contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to redirect users to malicious content. While no scripts were explicitly extracted, the presence of external URIs and the overall structure strongly suggest an attempt to lead users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://medvor.ru/uplcv?utm_term=how+to+change+the+time+to+night+in+minecraft
    • https://stratasphere.online/userfiles/file/timuzaporote.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/768ca43bb0beaf39eaa37b7ed3561c3d/wimedakutokenonixipakifiw.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3d22723e9---1483515296.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/42bab9f754db747136791748b64274e7/tobawojebapa.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/a8ad120d4ef77ce4223d972d38148920/54585765042.pdf
    • https://menu2uplus.com/images/file/tomimufo.pdf
    • http://geopraxis.it/userfiles/files/rewiligul.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/e7f33cb577f9dd19c4fa6748d633c243/74791798448.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/533o3frs636rk00dae3nf3c7oa/patipimovisudal.pdf
    • http://technology-mp.it/userfiles/files/12052483835.pdf
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/e4cafc57b9a4081391861dc5f7672e1b/76114702024.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a06b7f513d4---24303862939.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60dd464944---nebonenevozip.pdf
    • http://verypool.cn/images/upload/File/50282416171.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e223175143b---31666717976.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7f99193e5---watosizujafupemirofigit.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/6tlecfc7rk0820f1j98j6j4j8b/nifojerivuwize.pdf
    • https://acryl-bg.com/userfiles/file/8123400726.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/e85d44e34c89838d3f8bd74a21208d8e/zoxawerudu.pdf
    • http://global-insurance-broker.de/downloads/13509948657.pdf
    • http://digemnd.com/UserFiles/file/lukarogef.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/23ba211dc1401c3d9132d0d06cfc48d5/38742343621.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/6e1ac4555044251e3b488d9e4ae675c6/ruwojimalokolagugi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dba5.bin
4d490221c262977579f347b9b902ceabed97c808f473e75f4a6b6a675b5ff68d
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA5 10648 bytes
font_01_sfnt_off0000f3dc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DC 16792 bytes
font_02_sfnt_off00010bee.bin
6e7b4f01339cb8256a0da39047d3e164508ae341b7884ec59222a3b71471f063
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEE 17104 bytes