Malicious PDF — malware analysis report

Static analysis result for SHA-256 42be657248099dc3…

MALICIOUS

PDF

80.5 KB Created: 2021-09-20 03:15:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ebc6116835b406403e95c2e8c130924d SHA-1: 9b31b31f263b5a58c021ddca10162a2c6b9f33fd SHA-256: 42be657248099dc37a024620bc5071ab265921491147f2709ae6ac3c0ccec2f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites and other potentially disposable hosting. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://giorgimpianti.com/userfiles/file/40282626019.pdf In PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/67142282127.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16131439701a7f---zikileruwetad.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393e9de5d66---tibedabubujukuzes.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/xexuzagafowugabokuxaw.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161436c64e2535---gefidorag.pdfIn PDF document text
    • https://gulamanis.com/contents/files/zeketovurokotalajixe.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/jinitenuwuvazogaj.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/95507434042.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/11258446412.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/27839988319.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///fiwujas.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/13668055839.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614034c35189c---gojavumizalegajokufe.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614566c62fc18---firawofifumot.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/vepikakasokitom.pdfIn PDF document text
    • http://aprt1day.ru/file/72453975126.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nazisijobusutesexuba.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/58813598500.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/a544658194197020756dcb148704323d/16337935144.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/31471761332.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306f9c8285e---11969364515.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=80072efe+windows+7+ultimatePDF 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_off0000d5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCC 17308 bytes
SHA-256: 228dfb88a3680c1511ef16c11d7edcf7c7eaac7ead68304fd6a7cc8f5a0eadf1
font_02_sfnt_off00011ae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE4 11004 bytes
SHA-256: 5199abb4a08195597a12780dc3e1b9dc98654a2be9273ba7df59f1008f27edb2

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