Malicious PDF — malware analysis report

Static analysis result for SHA-256 933c4199ee431266…

MALICIOUS

PDF

88.4 KB Created: 2021-09-03 01:49:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2188e60b44e29bde5302124f3d5f3d7b SHA-1: 601c08e7f9d07ef1f1ff5b0da92aa5a4467df3f9 SHA-256: 933c4199ee4312665688a2d1b94136b77720a449eaf7fc13ddc4171238622603
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/f92321e33eb90cf013b36dbca956d316/93980680057.pdf In PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/cp360o5phnnea1d9sdpe3c5g72/taregebakofosuwub.pdfIn PDF document text
    • http://biotledlight.com/userfiles/file///togonewavutigitekelerip.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/tozotidajufagotad.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/2bfteu3hs6ilnf2uhfk02rgps1/24829572421.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/fasuxep.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/popigekalodefakofudep.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b752869742c---92748739751.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/jebawilesemejanazufon.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f6b9c027c79---dozuwewivelesus.pdfIn PDF document text
    • http://avonsteel.com/UserFiles/file/sulowitigemefedu.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/47290483251.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/e07a580b2d86beee1a26c5b4942dbaae/33953470224.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/74731448412.pdfIn PDF document text
    • http://digifast.cz/userfiles/sikegewimidezomokowipe.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/wetadudenizelil.pdfIn PDF document text
    • http://sam-global.info/files/file/27038668496.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/demalifafun.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/dejowanuwop.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/55071813723.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/29312767237.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=manual+de+boas+pr%C3%A1ticas+de+manipula%C3%A7%C3%A3o+de+alimentos+em+restaurantesPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAF 11552 bytes
SHA-256: 9063d77bc98511d38ee7ec8ca118e05fc8f9d424834f263970c6836cbfbd32f1
font_01_sfnt_off000108a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A6 19492 bytes
SHA-256: e0423db6f9575af7d8a059654a92248509397cf7f281e6b1f9b0648307779b5e
font_02_sfnt_off00013821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13821 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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