Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a0798f8d38f3bd1…

MALICIOUS

PDF

76.3 KB Created: 2021-09-16 14:26:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d35fa1e8dccc119cd79bfcb36742faa9 SHA-1: db57162a0a347fa487309433fc13027d54f1060e SHA-256: 7a0798f8d38f3bd155ed3a9796fc8cc56c20e6fff3d68860ea6603ac7c496b82
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. The presence of 'utm_term=javascript+tutorial+book+pdf' in one URL suggests a lure to attract users interested in programming resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://dotbamboo.com/file_media/file_image/file/vovoxolaki.pdf In PDF document text
    • http://biosurfest.com/userfiles/files/fukulera.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/xosadamiwerulunapa.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/zixufinetomewijubuxuwurif.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d47ce0bd9---xomubepirafopipojufuni.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/57279506702.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/limurobiwebakixotez.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/firisifademeviniliw.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135f1bc3f1b2---48704445132.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/jolokogugofulaxerawajaxis.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/tofexevi.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/55832747305.pdfIn PDF document text
    • http://schokofontaenen.de/idata/49176944969.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/gewin.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/rafudemo.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/23d2f4e1408560ee369cf85a9192c65a/29318043495.pdfIn PDF document text
    • http://kahasat.cz/data/file/vigematabo.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/20752522180.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/94161777178.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fdc87ab38---minixopadokakez.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/ce6330f45e8e26458cd0a432835952ef/98639238088.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/zazexijamujipopatiwor.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/20843553153.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff0a27e33a---tisosurifuf.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/161342279beb82---lakokakasap.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/vozaxinexogafisizojisu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=javascript+tutorial+book+pdfPDF 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_off0000c1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1AA 10768 bytes
SHA-256: 77fd74e70bae1cd442f3a852cae7fd89597d33f1e73860f8f59e53167f3d460c
font_01_sfnt_off0000da53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA53 18596 bytes
SHA-256: dee336c8ee7a5680c43fa9272fa4098aacf4e1d8261128886bd69a8a541a35d3
font_02_sfnt_off00010b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1