Malicious PDF — malware analysis report

Static analysis result for SHA-256 870c7e34ff62932f…

MALICIOUS

PDF

79.0 KB Created: 2021-06-15 13:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: be3fa4262a9af4e3be61938b46b3deda SHA-1: 944437beb2473917ab9e6ac328f45de4dd645c6a SHA-256: 870c7e34ff62932fc13a8762b02cc816ac6ab146f43e2022289060badf57b969
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains numerous links to external websites, many of which are hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The presence of embedded URLs and the overall structure indicate an attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://synerhu.ru/uplcv?utm_term=hsc+biology+question+paper+2020+pdf PDF link annotation
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16071c22ea7f6c---gaxanozosiwa.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/60888380551.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c67e5b0511e---37406563556.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/sri4h1of68o53ke2f83c1t4oru/lagazuxuwa.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706f14ce678---8827062593.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/dbbf21fc74657227f3065efb5014511e/gawazoluwixi.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083efe7b83ae---bagetevujolomemoloneju.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/5746499335.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1609426e9d6095---78435058224.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/ed162df0cfab9b280a76d998e2ea2ffa/59822388502.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/c2e4ddb296ab6622edda5af74b38dc37/dureg.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160968ce5a51d0---vojupujofitidopizi.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609584af71487---74937888516.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/2inu2vhgktgmolpjvqvmpd55u2/14178945035.pdfIn PDF document text
    • http://fygl.net/uploads/file/030752232182.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774b075233e---91069256789.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160abb1eaa28b7---noxagu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE380 5928 bytes
SHA-256: 974191705b05674b700ff4b00ba0b2627ef89be4196bbce1fac14fa05ac621ee
font_01_sfnt_off0000f7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B3 10344 bytes
SHA-256: 2e43e78645328dc26d47124767a926433bff1a68974dbc8b0b81b247248d9fad
font_02_sfnt_off00011b3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3A 4744 bytes
SHA-256: c22428fb61993e143ca069c32b6c485c1e1613b2a9c823e73a7b0925ac25fa49

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