Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbf3d6bb1f9e9d58…

MALICIOUS

PDF

77.3 KB Created: 2021-09-16 06:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6acd3b75fc694705591074fe5fb92269 SHA-1: 1e133082b9af3023acf5b1f7c289bd0c81f8f6c5 SHA-256: dbf3d6bb1f9e9d5828ea13cc8ab1b3f5cc67358e586f393a368906b0330f7cb4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URIs pointing to external PDF files, many hosted on what appear to be compromised websites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of multiple external links suggests an attempt to lure users to malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://islenapuntos.com/campannas/file/75857199196.pdf In PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/jajorudikusamefepidavun.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/boxogubepazik.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/rekerisuminid.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/xazitudodu.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/kafipamazi.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/f101df528f7d62a9572bda782e97b328/97310728628.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/pajunajizawu.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/sanabexenegijawidodejudo.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/tajijegagufu.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/gusokepikejimivasilu.pdfIn PDF document text
    • https://citronel.com/userfiles/files/nujewemadegofasopijuwelu.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/61260925493.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/xubefakipobasawedeporozag.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/c9dde37f2c75ad39d9f1bd3c9f84aa90/23268963095.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/161312ae30a7da---boxevi.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/49360899596.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210911_152805.pdfPDF link annotation
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/sqvncqa7b81gr60lmo1nm5l7o8/7150599944.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/35270560745.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/95518903540.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/60755991090.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=must+watch+before+endgamePDF 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_off0000c97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC97D 17336 bytes
SHA-256: a9db677962a186632f5963236b44b88dec0cdde0bfd7a9aefcf451ba8e0e5537
font_01_sfnt_off0000f63a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E51 11104 bytes
SHA-256: 78c645e15e7eb2857249d9a456ddb4807ec02c1e4e49911ebe3c35722e839ce3

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