Malicious PDF — malware analysis report

Static analysis result for SHA-256 29a5eebf2b4b6025…

MALICIOUS

PDF

72.9 KB Created: 2021-09-08 04:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a5e2b97af04e1973a2576f0b8b663d94 SHA-1: 7828de55f3c58cee295aee566a92d01951689208 SHA-256: 29a5eebf2b4b60252ea527d4ad1b7efffe79aa92cd7ea7eab605275c9b2a5a3c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to download a second-stage payload or redirect the user to a phishing site. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=schneider+electric+altistart+22+manual+deutsch PDF link annotation
    • https://tectrongim.com/uploads/files/fovenativup.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/zevejinatuxavusuxoxizob.pdfIn PDF document text
    • http://suankaew.net/upload/userfile/files/vegekoxekiduxu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16074ac453bc12---10030728099.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/e410d92ef089f3dd76e55b966c4c6212/69869747646.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/59060254575.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/rbrdqlh3of5dlkgavrukhpbg06/ribibetofaxoxo.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/96573284902.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/91026188715.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/8046237227.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/biliw.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/34686792194.pdfIn PDF document text
    • https://emprenderem.cl/files/xulatikowamevolopenul.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/49708655264.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074fca69008c---10262869142.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/91142991663.pdfIn PDF document text
    • https://tuvanthietke13-5.com/webroot/img/files/xigekeretot.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/83252565895.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16d425913d---fewufuzeregukewomezabetar.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0d57396f3---sesirijefuxune.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/34c99e081af4a79a23eab6c3ee402f7f/36041673429.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/kivelaxudomagebidaxigog.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6f0768ef8---15175584996.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/kofoxiwu.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_off0000b952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB952 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD169 10808 bytes
SHA-256: 468aeab2326ae546531ecd73edd79940fa0df47775687637c199afe1a725022d
font_02_sfnt_off0000ea26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA26 16912 bytes
SHA-256: d4744652331df1542d623224658ea9d3edfac30e07e49d0f4833ea162e1254d2