Malicious PDF — malware analysis report

Static analysis result for SHA-256 df7ce2e7d9294491…

MALICIOUS

PDF

75.9 KB Created: 2021-10-09 20:57:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4aec4e2d5b04798cb60c8212a91a169f SHA-1: 0cbd853a0d8d2c3f26c90d21f0595c4430e1f244 SHA-256: df7ce2e7d92944919cedece4accffa29d9bd010b08362ea026acbd1abdd69309
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on disposable or compromised domains. These links likely serve to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=compound+daily+interest+calculator+forex PDF link annotation
    • http://ldksolar-officialliquidation.com/userfiles/files/nojobu.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/161308322961a3---wofanoxaman.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/vejavoxubel.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/90598666676.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/40718732822.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/mewoxoligijuxasaraluji.pdfIn PDF document text
    • http://hoangminhsaigon.vn/@dmin/js/ckfinder/userfiles/files/23029083455.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152b9871cb78---mulagojosomijazigimizu.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/3362710651.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/2431623585.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/75559405264.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/raxuseligajum.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/80769582670.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/76084877445.pdfIn PDF document text
    • http://razzledazzleevents.in/userfiles/file/bototulazur.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1615749e298f94---podijodudi.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/falodadetamumigepi.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/xukijuxixadodoluvikuk.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/16964825969.pdfIn PDF document text
    • http://zl369.net/userfiles/file/fefexoxododajolumezobexin.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/46981673818.pdfIn PDF document text
    • https://ancoraeducacion.com/images/61749348765.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141a82f8562a---34433110486.pdfIn PDF document text
    • https://123natura.com/stockages/files/kabibezeten.pdfIn PDF document text
    • 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_off0000c3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E0 11128 bytes
SHA-256: 5255c919275e3c458bfa678110efc7c1030765086579dd91b48f4bf03a094d43
font_01_sfnt_off0000dde4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F6 16976 bytes
SHA-256: 4940c4445f6393cc45d5d5e056b2cf8ed15d3fa1eeddea71618096984ce64695

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