Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca768fbc471ff85d…

MALICIOUS

PDF

87.5 KB Created: 2021-08-16 19:44:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: a4949f94b551ea64376e97373dc5db46 SHA-1: 1fc4b9c4df57b93ff44ea44ce752a3fb2907f5cd SHA-256: ca768fbc471ff85d3afd2aed56cd68c384be3125571bbd5262084e8b05b59965
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress upload storage or other potentially disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and unreadable, providing no direct user-facing content to analyze.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://jordanadams.com/ckfinder/userfiles/files/8303986118.pdf In PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/098f412d80b1fbcee594042845881063/kibidedad.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/menemeloji.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/54724161299.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/boxifisuzibofovex.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/10298233634.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc9f048fef---bexefat.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/vowek.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/3173722797.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/5vpumr86qcf784i8em9smetkno/kolatenategojegukojom.pdfIn PDF document text
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/77530873816.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/11073774199.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb2eb932a9---83817722730.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/62645397872.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/loviladejisixil.pdfIn PDF document text
    • http://domplus.su/userfiles/files/xakawiwitoxitomexonobasi.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c01e946c4bc---rarovumurotetudupukaj.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210722_235255_3176.pdfIn PDF document text
    • https://rivaflo-south.in/userfiles/files/94731904549.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16075b516df720---93266874356.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/30210909187.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16098c188d82b9---xesafa.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/66516620520.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/14774535963.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=que+esperar+cuando+est%C3%A1s+esperando+pel%C3%ADcula+completa+youtubePDF 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_off0000e9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DD 18712 bytes
SHA-256: 581af32fc87830253fd5a65c10125445a50a57b6f0c4b602336135743e896379
font_01_sfnt_off00011a55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A55 11240 bytes
SHA-256: 92b31c5a7a1145ab6a6a4ed3797802e3ad4da4c1f8b12d3172b46b3f2121408f
font_02_sfnt_off00013430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13430 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1