Malicious PDF — malware analysis report

Static analysis result for SHA-256 57a179fb6b839364…

MALICIOUS

PDF

88.1 KB Created: 2021-09-04 16:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b202e1573b15b597bd33b34175972072 SHA-1: 1d8ae005912fce0df7fdc47eefbe311d7a920c2a SHA-256: 57a179fb6b839364d423caed0a913b2c9c2114cd38b1c1b6139022091e6c5464
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this phishing or redirection tactic. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e0824efb1---kisuline.pdf In PDF document text
    • https://airbays.com/userfiles/file/risopefipagolagobosalizad.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f09ec8ef6a---gewanudiwipowitujepebes.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a8d94cd4ab---fopekokama.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/mewedafu.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/rewejefuxalegogepaxi.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/59552597899.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/zopevavobezebabit.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/14bfvr7lug8etmh82hh9v6kbt5/vetetojatezegabutit.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/xexebaxobotureterafag.pdfIn PDF document text
    • http://covinahigh1980.com/clients/1/14/147ee80f0cf2e08ca1b5067d21485a43/File/kotixufobalelis.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/64456758166.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/35420443769.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/52869061728.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5d0b245ee2a719e4c6976a62058714ed/xafosig.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/e6c0d10a9504a14603903abcde355153/gipamad.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/695rgivvbptijbuvflnc56l138/47662248892.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0ad2c6477---60606112120.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/sibotozelubadubudofagiz.pdfIn PDF document text
    • http://scpt.it/userfiles/files/63447847641.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/fonaresabozojoditaxon.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021050701453796.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/fiwuzizadex.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/0b6f05b41a5d142c86e6df9c1416b55c/26181665949.pdfIn PDF document text
    • http://dgjst.com/upfile/file/57993611565.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/010330ad26d95dd9bab80698f0670df0/15375961689.pdfIn PDF document text
    • http://gulfapex.com/uploads/file/kenizobeziradikugobud.pdfIn PDF document text
    • http://atomleasing.ru/media/File/bepuzukegometux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=negative+contractions+worksheet+pdfPDF 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_off0000f051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF051 11076 bytes
SHA-256: a7b918dbca524960ef95dbed5ef5fed29486a9eded5816c4087a07e120e55397
font_01_sfnt_off000109ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12211 18352 bytes
SHA-256: 89a5aef1e0f9a8fa343e71a45353bc0236a3ae4d4b7a7d1a25c70476a1bb90ba