Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a6888b4faf7e50d…

MALICIOUS

PDF

88.6 KB Created: 2021-06-26 00:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dfc1bb336ad074a840b9cd48f1af0d85 SHA-1: c1cebbd6dd221557c96015928c58685507dcaaf8 SHA-256: 7a6888b4faf7e50db0d05a98132a06bf03a81274ba3bf062df2b6f1e247b425c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

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://coretry.ru/uplcv?utm_term=what+does+it+mean+when+a+guy+says+you+inspire+him
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/5e1552935e5b9d8695dec3276060f16b/rumepe.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f7fc6c309---68876494983.pdf
    • https://sabagdasarov.ru/upload/file/93679274359.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c201463fdd9---77702256665.pdf
    • http://cnzgks.com/userfiles/file///98658839057.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608a77eb46f9d---65619018468.pdf
    • http://makingthegradetexas.com/clients/d/d4/d4716c73f098ea79da165a2194b6736a/File/lagigonegi.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16081e772adb94---40070680335.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16091d3fc1dc84---rurivarevedunibofona.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/tm60knuanbi489250n13b49tb6/reruwenaki.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb35247edc---50427142383.pdf
    • https://yssnewlessons.org/UserFilesTwo/file/xinoneju.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4759cda9d---92297813278.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b10ddaa06ce---47418258478.pdf
    • https://hzautomatisering.nl/userfiles/file/wesajuxulavazixizumex.pdf
    • https://zevkotodoseme.com/upload/ckfinder/files/sadefinidenatezuxafafaxep.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8c5abf696---67831956935.pdf
    • http://agiusfuneraldirectors.com/files/file/resixolonibitelozutex.pdf
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea2b3afe71---94382778941.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/2ca1718c914f8c97fcd3e199b855a4d6/gugexelizutax.pdf
    • http://topenglish.sk/app/webroot/gallery/files/jenaterodu.pdf
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/6fb636c290e793d65af78b7db873b90a/5828330024.pdf
    • http://vankouwenenmastop.nl/UserFiles/file/88565977339.pdf
    • http://s292376414.onlinehome.fr/datas/imgmail/file/78353415800.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7d0.bin
1e34ec2cf997e95ea49265b7e0d7f2b44b453969d63654309d79f6e6f73cccc0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D0 16880 bytes
font_01_sfnt_off00012358.bin
8bdeaa5d4720dbb95b57edd3cbfb6af2697bfd3cec84e1eb5e15124b9901e475
pdf-font-stream PDF embedded font (sfnt) at offset 0x12358 11084 bytes
font_02_sfnt_off00013ce1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE1 16792 bytes