Malicious PDF — malware analysis report

Static analysis result for SHA-256 23f38be20f48b15e…

MALICIOUS

PDF

72.0 KB Created: 2021-06-29 06:15:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3e0ececce735a459b07a41007f388fe5 SHA-1: b213e4a45b333fe0322a25b5778364974e74edbd SHA-256: 23f38be20f48b15ebd6d764b3d093f452a50174f287d49e07483e03303eb816b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as malicious by ClamAV and an ML classifier, indicating it's a phishing or trojan PDF. It contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure point towards a spearphishing attachment used to deliver a payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6366

Heuristics 5

  • 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
  • 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://drafthe.ru/uplcv?utm_term=social+work+questions+and+answers PDF link annotation
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/c2454d4892b6abb10074586475370d7e/zusodejipulekajej.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/0cb32ff2310e266d74cddcd33e4b3da5/15703231779.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aece72caa9---zivulopizifelagotanex.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/9785139110.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a367d04d4d4---82679873481.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d06a0f600ca---xumaxitikeluzemodoz.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/pejiripakowawufop.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/9dc5c5372259f96b5b86a42e85897325/75250825180.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/femuzijidojokukela.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abbd673613b---wivorarasitolawaxenivigo.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160b8aed97982d---siwusaledejapetafa.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090d0c0d29b6---69736968860.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/darawanadedisuk.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/o1efbliplrf5916dm3uv42mcr6/64457666862.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d23d485b64c---ripipumuvewenegezu.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/rubatov.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/wonemonagetovomiposeloma.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/958607bfadf1a0126ed9a3291744050a/81357452798.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/41436590697.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/resilepadit.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/mndctmi0pa8ph4p9i7mtpk1gro/doserasenelosozefusamerek.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021062716021373499.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/85fa0bd147e50ab8e475c921d302a321/foxabopisozidoke.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7A 10864 bytes
SHA-256: 129f9bd0d58af0a84fa1ff4a3d169a92751cf4b62906b1cb9a2ca098f8a972a8