Malicious PDF — malware analysis report

Static analysis result for SHA-256 b210c899860d4e8d…

MALICIOUS

PDF

91.6 KB Created: 2021-06-19 17:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 6a694fd04366ad5ceca86de67caa217c SHA-1: 763d772dfbe3dd6f1b4b88f07d423825f3f517cd SHA-256: b210c899860d4e8daf1353e73497b2a143af88470d3f3391847bd112430d3052
164 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure of downloading potentially harmful files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • 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://laborke.ru/uplcv?utm_term=subwoofer+bass+booster+pro+apk+download PDF link annotation
    • http://sugarfree-gelato.com/upload/file/43743777753.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/lkgtq218ssfpcmhb77p8g9pkf5/nowunej.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/fujupowagivivaruze.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16070f8d701576---53253901456.pdfIn PDF document text
    • http://linkipt.com/_UploadEditor/files/54494856385.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/juh8t0olv770s5c49813set6st/janozilon.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/827a1473d199580c3592fb6fa0bbcda3/fatevevamowarete.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/drfpr6hhb94i27m1ekod4oji65/jejemivitezuna.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/66e1bf79dddab50a1039f4c1956222f4/35105809660.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/845434f1c8cba58b50ae54fff8f97bb8/53807312166.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/5f18293a298e1969054773e6b5aec341/21160946279.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/f78e0bdce6e529ebea665048815cbf4c/15707299830.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/69630026042.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/natawed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD48 2996 bytes
SHA-256: c754879f35cf667d5c5b0449bf7b7884ad17765573ae5fcd8bfe39c540121b62
font_01_sfnt_off0000e80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80A 5268 bytes
SHA-256: 262d7c71a736fc9cc61a9d46e57b0591ce0d15c559f289f347ca3d69a258e1a6
font_02_sfnt_off0000fa06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA06 4232 bytes
SHA-256: ee85f18189f41c8453277d678f4c06588d931a4551391b723a5e05c3b1215de8
font_03_sfnt_off00010a5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5B 11576 bytes
SHA-256: cbe951e11bf12cbbf609c5ccf7526482e7c2d8371d2ad695527046730eea54c5
font_04_sfnt_off000131f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F9 17656 bytes
SHA-256: 1bbd83232b81ba49f5f1851961473831e039dc2845bc08bb36610171432eeed6
font_05_sfnt_off00014a82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A82 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71
font_06_sfnt_off00015835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15835 1736 bytes
SHA-256: 551918360585b1590efa6fd2a215345b2f702067d151a0e4b48cfa7490b57960

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