Malicious PDF — malware analysis report

Static analysis result for SHA-256 8efaa14382e78e9a…

MALICIOUS

PDF

82.6 KB Created: 2021-10-10 07:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: ac1f3aa4f311df8661998a2e37a97c07 SHA-1: b6b0e7c6cdf9a717454b778eb74c7ce2101eaebd SHA-256: 8efaa14382e78e9a3295fb6558cbed5e54262eb51549a154dcb166fe4bbc520a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such documents for SEO manipulation or to host malicious links. No scripts were extracted, but the overall structure and URL patterns strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://huntic.ru/uplcv?utm_term=spanish+for+more+crossword+clue PDF link annotation
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151343d741fa---bipokezawulovebenajoguzos.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210920184709.pdfIn PDF document text
    • http://thueotodn.com/uploads/image/files/polagupuwuforilikabexati.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/fezaparixotub.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/52386771580.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/81256535275.pdfIn PDF document text
    • http://luijkzonwering.nl/image/file/78310827893.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/lomopev.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/piboparora.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/6d22103dd39989f71684197d487ba235/kosejegu.pdfIn PDF document text
    • http://pilatesmystyle.com/userfiles/files/ruvamep.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613993f01fbaf---zararuvonosizugotapapol.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/dujodovok.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/dezipexidito.pdfIn PDF document text
    • http://lex.tj/img/file/fesomasomoz.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/f2e15c2324d9a5413d239ff48c6aacb1/33612942320.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/94224873504.pdfIn PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/pomalikezu.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/66312698804.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/foxejazedetumuvidavobigow.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/87381623453.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/23982086276.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/87969649874.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109221649013216.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/55b5b7f76c1c1d2e44f2e050d5134078/96933899233.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_off0000dcb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB1 11048 bytes
SHA-256: eb224d53ddf8ff2e2d69cf45146c3f5ac3dfd5a7724a1ceb6bc12ea7786ee0a4
font_01_sfnt_off0000f639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF639 18164 bytes
SHA-256: a49051bbb13ab326612403e21e2e11bf46d903d7e921afe3ef77898cfd3b3029
font_02_sfnt_off000124cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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