Malicious PDF — malware analysis report

Static analysis result for SHA-256 426e69b970464d1f…

MALICIOUS

PDF

87.9 KB Created: 2021-08-14 01:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: dcf1a09a23d3f5db1e02877658058292 SHA-1: 373781120d0d4a32c057ddcef4a7aacb74199c93 SHA-256: 426e69b970464d1f324695fc385f9343375792ea7e642218f10083baa1d2de10
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, identified by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs suggest a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f13b35f5e---20776316625.pdf In PDF document text
    • https://greenvision.vn/hinhanh_fckeditor/file/talezubipapiwepo.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16076a4d330caf---buviga.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/xujozusumugurefok.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c91b20dcdf7---nosizedaxoxunasile.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/br58eo3bml6hncsauteid5teu6/53898679893.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/dilusujijura.pdfIn PDF document text
    • http://charivne.info/images/file/jagosuwu.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/guvunatuxiwixadugab.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d0a610ded---95606637706.pdfIn PDF document text
    • http://fittbikese.hu/files/file/tobidurerinazit.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/3989094931.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/ofi14mmiv46fpfasrhvl552gjo/fomokivo.pdfIn PDF document text
    • http://coumert.com/images/file/24147826271.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/42729754290.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/mavikufota.pdfIn PDF document text
    • http://slp61.com/clients/e/e2/e296dcecfd7d10ffef0cc83fef253c72/File/65799522833.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/jalafoduranifavuvagas.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/dasiluwedewako.pdfIn PDF document text
    • http://jafra-com.at/userfiles/file/57532101820.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/9401598d6cb086ff629d6d10f6f5524b/vuwaxen.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a29605c40b3---deferedajurafexifukudujiw.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/gnk9cerp3drar0oon73td519jk/76322858607.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/lodovejamoxejedof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=descargar+m%C3%BAsica+de+los+temerarios+mp3+gratisPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68E 11044 bytes
SHA-256: fdbe68b2b64a4bf7da0786abeb9d69061f7e5815c679222661c52264823ec77f
font_01_sfnt_off0000f024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF024 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10836 18128 bytes
SHA-256: 92bc90628c8998324d079910fde14d6b5ccbd4ddd1cee11a1c9b17146ec6ebf3
font_03_sfnt_off00013639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13639 16944 bytes
SHA-256: ef0329dac4803480f2d6f4d9e9c4ba3aed2817dbf0857a17f9b8becfccd91a33

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