Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6f68c89415d95fe…

MALICIOUS

PDF

74.6 KB Created: 2021-08-29 23:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1c2edd46437fb3f2ccb90dc8c6c61dbb SHA-1: 2d984e04cd433a254f9054207b2b3080f68fd54f SHA-256: a6f68c89415d95fe358927a0466f9a83d82afe01a33f551ff2637febbc66d78c
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common distribution method.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121847469051---futenakuzurewilavuloke.pdf
    • http://gat-asset.com/CKEdit/upload/files/43986466649.pdf
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/6554d7f835425ff54e83aa8e8d43fce6/jegofamod.pdf
    • https://boumqueur-edition.com/upload/fckeditor/file/navazuwoxosutunaz.pdf
    • https://arte-salon.ru/upload_picture/lalupomagifixu.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608832545f353---56179158331.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c39b6b96890---80708298609.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a59c9e700b---torabofomemezudef.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca5d4c8a72---gebabageboleropeluzurib.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa40e24a712---82298872509.pdf
    • http://cinebuzz.be/uploads/userfiles/files/wazonadaluxepiweludejavu.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ba152f85639---derovi.pdf
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/muxabowojepowitut.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/e033fd2a2b82cf8b0feee254d7cb76b8/21783133323.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ce7ec65278a---salikekukakoxomesufem.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b87c58acb3b---73832681557.pdf
    • http://intergeored.com/upload/File/35984985131.pdf
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/qunq01rkf00c67759egu49thg7/58737873318.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161174206dbc6e---30000408347.pdf
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/fosuzagefejawadawepesovo.pdf
    • http://daisytalavera.com/userfiles/files/gadovekuguzonusef.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=lilac+bully+for+sale
    • 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_off0000bf80.bin
509b65714bc5fbb353630f779531aeb2686ee9c995bdc3fb72f3f7a021d79fa6
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF80 10436 bytes
font_01_sfnt_off0000d754.bin
7709dd84bb8962ca1b3d73c6ce9a2eacbb2efe1c6bfbeb1e7a360a83a3d87dde
pdf-font-stream PDF embedded font (sfnt) at offset 0xD754 17188 bytes
font_02_sfnt_off0001036d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1036D 16792 bytes