Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f20ea5233933692…

MALICIOUS

PDF

113.8 KB Created: 2021-07-31 09:17:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1f4f1485583103c4835dde1345cb5e22 SHA-1: a684ac6ed121bc619e733eb71625c0aaaf0e9eee SHA-256: 1f20ea52339336921a3666f760b7e2ae13e99bbb1382241ced0101794f5fb3b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/3gte66f30halg8nl07psjtaq10/20512192134.pdf In PDF document text
    • http://sillajen.com/fckeditor/_upload/file/44949656464.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/48433712538.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/49790105274.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/10762285536.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/9be044d7d58a33908ed15ca854a1135c/96820114312.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/28914565557.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160795392f3eba---firurororop.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d883efdb4ee---55746364021.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607568a75aa22---begovojege.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/mjmigp6357k1v62i7fvpb1ihhp/daxaki.pdfIn PDF document text
    • https://unosms.us/userfiles/file/11300390003.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/71345d81682b79a0e81369b73c8b9789/dimevanenano.pdfIn PDF document text
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/55871238649.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/a6bbdc5714ef28eee2fec152c00f8e63/nikubifidewuworuwe.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce3238d8fac---86158165093.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/f4bbk022gaorschpe9n3ma2ml1/nozipometi.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/gameg.pdfIn PDF document text
    • https://raljob.com/userfiles/file/4513232637.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/52400081481.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/8729524602.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/35459120959.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/766be304eb4804bfabbd752830a680ec/burijonipuvunekokuw.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/zumidima.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=diferencia+entre+la+teor%C3%ADa+del+poblamiento+temprano+y+tard%C3%ADoPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000151a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151A4 20428 bytes
SHA-256: 63fdeb0567ff58d25ab902868aca5d0e3fb035e34837eba2bf4e78b9384775b8
font_01_sfnt_off0001847f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1847F 10928 bytes
SHA-256: 163ae607934771db239f99e07a2dbc21e6f3ad2da4aa056c79e5096db8378994
font_02_sfnt_off00019d89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1