Malicious PDF — malware analysis report

Static analysis result for SHA-256 f275b7f2acb559d1…

MALICIOUS

PDF

82.4 KB Created: 2021-09-06 07:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 99d51e805922ae8b3ce275d24265c2c2 SHA-1: 834555439437e60107e908045a4f6974448de960 SHA-256: f275b7f2acb559d18a317d9ca4c83d15e4508fc5ae44d030e37d8d4aebee6ca4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://pass38.com/images/contentimages/files/85971684538.pdf In PDF document text
    • http://vanxuantravel.com/upload/files/xaporipebumavunonetagodep.pdfIn PDF document text
    • http://www.asslar.de/downloads/kawipod.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/66003020678.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/duqpgh0g5bqsbm5867hh5iqku3/bizib.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/817caf3ab82801ba59ad8bba975f0f64/sumojofozizubegefogumomi.pdfIn PDF document text
    • https://ccskin.com/geektic/files/45998565770.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/tuxoloxarero.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/rulijowefasepunof.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/d28u33uuieb508v0msg5fobogf/revifamevan.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/zasojabixo.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/xezomawikoxutozilevivesug.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/5f1e84d725fdb8cbe37a6c0a48c59c86/50485523124.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/s3csrcq8m7jdvvrus0jsdvuno4/gufufejo.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/rujaxutaputapakuzibis.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/s53nej2u8ngd49lcmuft8sfupp/5090616051.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/3bbb5662e8b827f145483aa164f97737/54212769994.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160708eb173cfe---doxukadafavojedoju.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609c62e010d60---10554874998.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/c21b443e8b6dee045626894833443173/81831262470.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/42585659318.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/13kh5f2du8hf4avnrn3tsl9jic/29401118185.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/77461570390.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b01b50d4553---37543043102.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/jijawin.pdfIn PDF document text
    • http://oembag.com/uploads/files/202108300615328496.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/57809981384.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=kia+cerato+2005+service+manual+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_off0000db38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB38 17720 bytes
SHA-256: 3d458ffe51818e6215f7b860fc8221d8cc08a5225263ff2eec23bfba24d70904
font_01_sfnt_off000108e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E4 11316 bytes
SHA-256: d93af5d4fca349cab0a44fda829ba3403ea8044f6229edf5abf4b589674c8193
font_02_sfnt_off00012398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12398 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1