Malicious PDF — malware analysis report

Static analysis result for SHA-256 8be6b96625e60ba6…

MALICIOUS

PDF

81.2 KB Created: 2021-09-10 21:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b390526ca0218d0692ac9299358413b2 SHA-1: 8ffb98eee7405d484417620ed82fdfccb68a5464 SHA-256: 8be6b96625e60ba61fdca9ec7cd1abf8cd73d599715bd9103b8c32267a849ca0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier returned a high malicious score. It contains numerous links to compromised WordPress upload storage and other disposable hosting sites, suggesting a phishing or malware distribution scheme. The presence of a 'download button' lure further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwebjor.ru/uplcv?utm_term=hitman+3+in+vr PDF link annotation
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138676b8a6d2---vewiwomurujuwefe.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/27662297206.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/56752596161.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/44368883874.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/wosumapipewizubisafife.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/kotigakovek.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/39954033400.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/62624230753.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/26555897053.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-3/20210903000845296819.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/pazevibuvovupaz.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/qjg3njedqvjf3mv9sd7r4h33tj/79065331420.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021090716451373499.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210910_C4091BD17B5AAD0C.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/61287167553.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613005f572b93---dinekegegokixetu.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/sibuzamon.pdfIn PDF document text
    • http://tid.vn/upload/files/41540053099.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/3210826611.pdfIn PDF document text
    • http://koddous.com/userfiles/file/fopuwaninuxatesosunar.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135e80c9dd2a---57349659596.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/mivopovovuvezapogolud.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/19713078066.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/rupuzumagofosatige.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/zavaluraxorumavevomo.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_off0000d2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A9 20560 bytes
SHA-256: 478f86946233ee8a8e37c0a3c4aa17aecc61c0755a43d5afb6e1257abf100642
font_01_sfnt_off000108c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DC 10032 bytes
SHA-256: caebe336284984a15c715f20882d6005faaec58dc4c8be3e3fa9f38548ef07af