Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a13b6836f8b769d…

MALICIOUS

PDF

100.5 KB Created: 2021-09-06 01:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7e0a172a7271f91e515a4b92abb68b36 SHA-1: 1af9db2159a30dcb2808a380c264453ffa63ca65 SHA-256: 3a13b6836f8b769dbc9263817f3b44bf68ebcec08473d81007248cfe900884e2
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The presence of numerous external URIs and link farms indicates a likely spearphishing attachment used to lure victims to these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/e6ae6b6b5cd5bc31e84d39c377a66068/78801138877.pdf In PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/vojosivudimupinadoxuzujut.pdfIn PDF document text
    • https://uudanbury.life/files/file/98870973170.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/jelavevomopunamedobejamo.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/57544921078.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f297d0808---45024746530.pdfIn PDF document text
    • http://home-delighted.com/user_img/files/foxegaruzakelisewafi.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/nukuxanularomojew.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/21205509454.pdfIn PDF document text
    • http://gojjang.com/uploads/files/62204225425.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/h4lkqctnv0nb93ilado88pc4p0/soveluvadolebem.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/57694369261.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfee1ddafc---wigimokotibal.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c17cda7b11d---rejuxupurewowezazak.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d636caf0e94---novetuxukagozuxopakega.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/52100408671.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125a3baa8a71---birolukugov.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/f3bc7983835f2756ad0da05ca76fea6d/66562645769.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/noxizebasituzobatup.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/58b0ca33292806ad34bdeb1d2279d9d3/nozopesigan.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/60456324811.pdfIn PDF document text
    • http://3sdent.com/upload/files/defotobibakepifu.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/4e8fb97a16526ef24207216bbfdfda16/geminaguzebomibuxus.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/vatenojawufinupevalurin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=the+cyclops+the+odyssey+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_off00011e49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E49 10336 bytes
SHA-256: 88ad177fc81ceec6fe2a7ba149869b3a79a349e0c4817b317c517ff3181b77b5
font_01_sfnt_off000135ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135CE 20736 bytes
SHA-256: 4bd9733f0dfb5e55e9f0e83143def2490c91a9f561e3a7794ab1527908888154
font_02_sfnt_off00016c3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1