Malicious PDF — malware analysis report

Static analysis result for SHA-256 b16cee4769c24e32…

MALICIOUS

PDF

86.6 KB Created: 2021-09-04 13:24:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 54696ed41aa895cbf1c299dfb76affda SHA-1: 3db56b4e34206f6fe71e0d785f0880895a024973 SHA-256: b16cee4769c24e3278428244a5db9382ad67ede2926a062b528724456c57e8fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://chcial.ru/uplcv?utm_term=interest+rate+parity+theory+pdf PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf547a733c---61310968958.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160835977485a2---89816740225.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/waziriva.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cca971d4ffb---gawaxidemojuramuwajedu.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/81928966386.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec729ebda6---84405895155.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/67500125252.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160da3cd64f450---vozirux.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/jl48losiug6s4hoq1m7vvfbbg8/guxukekedika.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/guminudibajivasasiw.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/sakuke.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/zikivakugoroz.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/632bfdd5ba492a9d14fe70dbeb0bda74/jejabebebunuvifabere.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/2d10fda0e5d77f1228aa8f5873f604fa/liforawad.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/22013896995.pdfIn PDF document text
    • https://kaptenhoki.info/contents/files/zenagunalemozoxumisag.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/jbnlvtibg3qd4bc6dqp68d6d11/30517929283.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/bavamawiw.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/10899398563.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/24486923334.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/4e93dfa7095785dd264bd772fead943c/pebogifesupax.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/2j7nlkl287orccc8t7iqr9039q/jiginunexejo.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/virurolibexakani.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_off0000ed59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10570 10616 bytes
SHA-256: 52e1e64275a4b9cda3110089a58956c43084ef908db9ab2443264a7434bccea3
font_02_sfnt_off00011da8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA8 18208 bytes
SHA-256: 6c39a453bddd80b714222b589e3ea835a5a3eee69a5a2674618f6dd802c29374

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