Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a54ac1d7d44247f…

MALICIOUS

PDF

81.4 KB Created: 2021-08-31 00:06:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 82cf321937471857032e9da635a0ac1e SHA-1: 2d08bbcdb96f5d767f6b1fd60144dd67eaa62969 SHA-256: 4a54ac1d7d44247fbfbce5a809df610a29777307e746eefb0e32be49ab759383
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics reinforces the attack pattern of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://synerhu.ru/uplcv?utm_term=dc+machines+and+transformers+book+pdf PDF link annotation
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/fogowoduviporozo.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/2bmme1o3o8glh77k4ptevfpn5n/38495318612.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/wifulagelosefenu.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d26d8aeceaf---92306491388.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/921cb25b7220cf8dd8ff6d096828ece1/50371343713.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607034d97a126---towumemuwogop.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/14061862334.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/e445686e87e6906d210a866ce3f684fe/pugepamabodinilenajawi.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/d9385e67f366f0c948a2f8a750d8efc4/jejipimizugipuv.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c613b638e83---88609001712.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096829637cec---43645761788.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/503260275.pdfIn PDF document text
    • https://istanajp.com/contents//files/fikuxaxudowemuxex.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/zemoxujiludavamobos.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/570e0916da018ad4ca8b8c45d3c446cb/21986869390.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859f52d4eed---75318940083.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/63252181943.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/32214118753.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/vn29utff8adbqgjmpclfqkvqq4/83582571119.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210730_80B3F648FB3EFA27.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/701f85375b610637def942918188f712/28851247057.pdfIn PDF document text
    • https://argumentua.com/i/file/malibimi.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0b208dc37b---busewaro.pdfIn PDF document text
    • http://centronegozi.com/public/vepowosuvejipigem.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/gevomatibiv.pdfIn PDF document text
    • http://bscartridge.com/pic/80261705539.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_off0000d737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD737 17984 bytes
SHA-256: e9b6d10d01df2e9d3472bc7dddda900632df1484fdb1d0663bd5d505f740a440
font_01_sfnt_off00010644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10644 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5B 11072 bytes
SHA-256: 08fe3150f72713f5d9539bc98d8f9e075f5354a1d1b46c628e4e125f23f5a1fe

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