Malicious PDF — malware analysis report

Static analysis result for SHA-256 b11e137d78b57a8b…

MALICIOUS

PDF

136.3 KB Created: 2021-08-15 07:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9784abe0a55a668329dccddb910108ac SHA-1: 0ff891a33af7cf17c52495f04b265002f22dec7c SHA-256: b11e137d78b57a8b6b8b0ac75c2ab1b9648dba2b0f6b28214cc4f6927636dedb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is often used to initiate malicious actions. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9220

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://huntic.ru/uplcv?utm_term=is+the+collision+between+the+ball+and+the+pendulum+elastic+or+inelastic+justify+your+answer PDF link annotation
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1a4f32ada---78798373390.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/banagetakafut.pdfIn PDF document text
    • http://greenhousehotel.vn/uploads/image/files/44834717481.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/4b0a1bc19c3dee0e0e7f704284b5a19e/dasarigulivegof.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/68387792462.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607050459d463---vilelosifugejisuvise.pdfIn PDF document text
    • http://goergenpainting.com/clients/0/0d/0d1038892961fdbf96b6a8e7e8daca8f/File/xutamuset.pdfIn PDF document text
    • https://evboosters.com/wp-content/plugins/super-forms/uploads/php/files/f2cf3c990e6363ee2045f4463d12af1f/memaxeferelijelaza.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160bffc61d1dd5---84165905794.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/cfcu4vgu0hl9b46kem8t4g9cnc/fixuvurag.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160af65e23b0c4---famatumoxasaboruridenile.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/61038690.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cea18bb3fa---55093952624.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609caf8c5d15d---tojerizumafidatu.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/mikefazolu.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/19576574804.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210814110946.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cabb104d1e---ditokelotadowasibum.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/2bb5a67ba554fb93ea98dcfbc9a59472/diverifixomopapumol.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/wusokubinazexefedirojeb.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e2966785f25---41598856616.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/s1njd8rt1u1tl6va2d0dmu2vi7/59422380744.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/sijusivojakixike.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE8 11404 bytes
SHA-256: 106da90cf6d7de7a4c85e7cb0e63712eb6180a9ea8e41b72d18f954bebf07587
font_01_sfnt_off00012767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12767 52096 bytes
SHA-256: c9b057a6cc1512d004151dcd983319e16bd15232b163145c56b17d44169e9ebe
font_02_sfnt_off0001b4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B4C0 16216 bytes
SHA-256: 8c2e9d80d580d08964a5048de7b59c27befd741f1c379efd0abbd599686b3e88
font_03_sfnt_off0001ca6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CA6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off0001e27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E27F 18176 bytes
SHA-256: 437f220b571ca3a90b37efa513e0c3650aee14c746ad707bcd3fcad3abe0ad6b

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