Malicious PDF — malware analysis report

Static analysis result for SHA-256 24d92292d63c87d6…

MALICIOUS

PDF

87.3 KB Created: 2021-06-27 08:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e893cf591095184f941b594bc1961846 SHA-1: 3b1080d4622515549d12d2f84a350ca60b1442cc SHA-256: 24d92292d63c87d6c8ee4e34a9f7c50a03476b68c689422b54efe98186ce07c6
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple domains, many of which appear to be compromised WordPress sites hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160747c29672aa---gekoti.pdf
    • http://villa-carlshorst.de/sites/default/files/file/5387431284.pdf
    • https://cosplay-expo.it/ckfinder/userfiles/files/76884777985.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160759db894e7c---26364989630.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ece094ec29---76061788052.pdf
    • https://viboot.com/ckfinder/userfiles/files/72021297813.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/d4cebd43ffd2d41b2f063ee84f5ac995/nusopofuwu.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ccedd785ddd---vovidinejalakunedu.pdf
    • http://tasarimak.net/ckfinder/userfiles/files/pogamaditoxijofegixa.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/a02d951c0b906f03750788e7a5d8528a/37280118483.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae82789f83---10847559449.pdf
    • http://toyteepee.com/uploadfiles/file/2105170358387290577r0hto.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/b847403fbefc47c67e770ab0c84fedd6/nerunoxosusimuzorokakalat.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607576e5aecf5---66795412563.pdf
    • http://www.klimavill.com//data/editorfile/30939712250.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e4e95946d---robizobemalonowonaru.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c03f4eee1ab---14303650968.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ea858d47c---63069919402.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f1b21d008---nelisanugifuferike.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607594c8195b4---gajumanifekifuzemo.pdf
    • http://foto-klub.dk/userfiles/file/85218887481.pdf
    • http://teenmag.cz/userfiles/file/1261313271.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/jidv80nfau67q9gqv8qpdu7jte/179965010.pdf
    • http://dailyxedayhang.com/userfiles/files/xagotasedafojosabimita.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1608126d7f4111---81291501335.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/pgh1956sjnrofmhhs3hur8b0l3/fopuziniwoviv.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=1994+mary+shelley%27s+frankenstein
    • 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_off0000f0a9.bin
093decaa61573e1269a53987c177e0cc72a17df52ee22f243c637713a4f825ad
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A9 10800 bytes
font_01_sfnt_off00010979.bin
0e22fd5946d5b249d4c369cf9b570b9f4e41b845faebaefececc93f22d2ec1dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x10979 17208 bytes
font_02_sfnt_off00013627.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13627 16792 bytes