Malicious PDF — malware analysis report

Static analysis result for SHA-256 26d5dd641d7725b4…

MALICIOUS

PDF

91.6 KB Created: 2021-08-02 01:38:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e1bfb80dd2650934d36b4bfe3827541d SHA-1: c36e18386ef330afb8caf4eebd233d2777220f78 SHA-256: 26d5dd641d7725b47f0c673341e1f51764dcfa18f01f90fb17e36e8e304624ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous external URLs, many hosted on compromised WordPress sites. ClamAV detected this file as Pdf.Phishing.Trojan, and the ML classifier also flagged it as malicious. The embedded URLs suggest an attempt to lure users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a29d78c8dd3---19322552753.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160f02a510818a---35826217448.pdf
    • https://pellevah.com/upload/files/86600998300.pdf
    • http://provia-events.de/pics/fotos/1/file/rivajosejanu.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b745cd68020---xevoginunowow.pdf
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e26c417190---kurugazedavelegunuje.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/fd5588b24451497d74e1e334ee518360/dakovovipor.pdf
    • http://vorne-sitzen.eu/pcms/content/file/10692736377.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/sfqnqctarsh4muvavnbm1q8kke/lizejegosoduwogu.pdf
    • http://k1a.ru/images/files/file/lesevumoj.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/41152506644.pdf
    • http://fitnessklub-impuls.pl/uploads/assets/file/12573730791.pdf
    • http://ort168.com/upload//ckeditor/files/pulisepivifubedunup.pdf
    • http://files.ibiza-ferien.de/file/bumupawazirisal.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e48ce33ad8e---pumebanagebusirigonun.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/65c3o8pmumv7hca43hgu2r6cac/355202683.pdf
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/50492468678.pdf
    • http://automozg.by/upload/editor/files/luzanidegudopaleliluneg.pdf
    • http://remobudostol.pl/pliki/1822087872.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/cd265d5989a86a6557f254495637500a/28833532600.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a82eab03710---mebedafurulopabizigipur.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/tsnifkjq59l2k8mqe5vub3jfki/70364033540.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e0e1b038f---39485888323.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=best+beginners+piano+book+for+adults
    • 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_off00010454.bin
193528747e44eaa70f42a68489a30b586ad05cc7b9d00578f6def14c3af95d2f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10454 11056 bytes
font_01_sfnt_off00011dd1.bin
9f1c15f508ac9e5475b99d0500765d2d9cf7d6aed098786bd42fdab9ecf19ecf
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD1 16616 bytes
font_02_sfnt_off0001488d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1488D 16792 bytes