Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b76f5bc58713d7f…

MALICIOUS

PDF

69.1 KB Created: 2021-09-29 13:44:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 574eab5546715a84c35b6e61df722ce5 SHA-1: ba59b213cf86d038898179c8ce276e73c149cd9f SHA-256: 9b76f5bc58713d7ffbd1c64e0a7c577ee7c93d211bd804727421d8891cccc83e
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm, with several links pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://smidgel.ru/uplcv?utm_term=hercules+movie+watch+online PDF link annotation
    • https://gilbertems.com/videos/file/10348606208.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///60479808963.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/64806580163.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145a3e81f8b3---gibigesavugukovot.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/21289090611.pdfIn PDF document text
    • https://viktorina.ledoritulys.lt/files/ponewona.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/62228735802.pdfIn PDF document text
    • https://kawanmto.net/contents/files/92191875008.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9ec2e2ef6---jovasupekoregowuxa.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136c72d86fff---fonakaro.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/365518fd0a3ad5dcd5c0740435b92915/ximelexar.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/54958306489.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/bufanipamefetenij.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/rofisebubu.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/gefunisedovibo.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210906_ACDA55ACAC45B3FF.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/9352c533eefb116e98cbcf48212719ea/98539957298.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/kelawunexobag.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/58464715999.pdfIn PDF document text
    • https://rumputhijau.com/contents/files/98228717517.pdfIn PDF document text
    • https://ismart99.net/upload/files/bonexoxupalemiwuku.pdfIn PDF document text
    • http://centronegozi.com/public/tufir.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109042354017907.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/zosodan.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/kejimugavoxaluturidaj.pdfIn PDF document text
    • 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_off0000b080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB080 10740 bytes
SHA-256: 6086bd9e84c3e717efc56ea47476e7986fdf1c55b3c473802b7a868efcfaaf53
font_01_sfnt_off0000c905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC905 15136 bytes
SHA-256: d2d60a55f32c07e4d18044bb03bcd67c65c7bbbcf7c207756103daa72941fd27
font_02_sfnt_off0000eeeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1