Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4e8df320e1a7f91…

MALICIOUS

PDF

86.5 KB Created: 2021-09-10 05:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ce52b1c7cd2ce28ae4b2c19596a228fc SHA-1: e41ee57a73c19dac15a7a7d3a9825e9ead56f158 SHA-256: a4e8df320e1a7f91ee03f8fcaae8b7d81a795bea7a6fc894cb5a4d8afdcc5683
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external resources, many of which are hosted on compromised websites, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://tinhdauvietnam.vn/upload/files/55294276879.pdf In PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/90212118787.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/22917686873.pdfIn PDF document text
    • http://elitvorota.ru/f/file/29201288213.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/40164745823.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1612f80c262639---miroboxuximoj.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/18645967559.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/vikotideguxigeni.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/67b29ad4777d04ff76d20d033e8db0dd/kokazutelur.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/kamekegilogigovositujobo.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/67f7a5128a9f10c541166e45ed59e04a/54816101015.pdfIn PDF document text
    • http://songdolandmarkcity.com/userfiles/file/7385865496.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/in38pdkgnqvk96vtps5a6cieaf/97503214634.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/41082643430.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d48762e76---68771994726.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/werikunanasopumezedotex.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/67235007244.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161331555a7792---repusavuluwowajunum.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/pugolurod.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc1431e633---xaxebovaveno.pdfIn PDF document text
    • http://htwy.com/upload/file/bajusadowonav.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/kepisamubujubi.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/231271153.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/24035905659.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=download+sonic+mania+apkPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A9 22548 bytes
SHA-256: fb2c8b34193f5f7f91ce5cd88951276be21738132a7c3b17da8caddb17657327
font_01_sfnt_off0000fd8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8F 10524 bytes
SHA-256: 28d1ce9b14262c4a4df34802f14d07bce337b52ae0a56a5c346cbd5de4431407
font_02_sfnt_off0001157e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157E 16180 bytes
SHA-256: c0217721a1102ad1f8a8ff5461faadb02f26a3634bfe128d67f68b25b112ee8f
font_03_sfnt_off00012b27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00014334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14334 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc

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