Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b826e983157c487…

MALICIOUS

PDF

80.5 KB Created: 2021-09-02 02:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 80a4519944be4ecc9b7641d6a2d887f6 SHA-1: 642c2c6ce84acdb42878c8b2cedd6d156c795fda SHA-256: 1b826e983157c48780dbc7807e27538687ecc7b0f6b5a5949b65c1ffe88ca164
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=low+glycemic+index+foods+list+chart PDF link annotation
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609b091114fc5---65246871751.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/vubunupajejezi.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/mobafarelagolesed.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/xumawekil.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/xupef.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/4901381453.pdfIn PDF document text
    • http://tchid.net/userfiles/file/62155315176.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeaa7f4a17d---7166655999.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/18e890fbb9e3054ec710a7fd6fff772e/93729508164.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/penujoz.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/soruvizomobovebubezusu.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/sogabuzonemedudosa.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/runiwewezukuduwaw.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8a7c752b5---rexixemulopefi.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6104e5b43---jazewafisigisox.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/81755354125.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/bb0ba7804ccee9e9f9cb461aeccc617f/kizopuk.pdfIn PDF document text
    • http://lighthouseofworship.com/clients/44803/File/35641339315.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba3f38a593---71870594654.pdfIn PDF document text
    • https://schmitz.cz/res/file/bejuse.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/82526750009.pdfIn PDF document text
    • http://r2doodles.com/clients/4/4a/4a4ed909dcef54c1e3ec6a0ce1d29f2d/File/sibasedikifurekalobaku.pdfIn PDF document text
    • https://pellevah.com/upload/files/11317891903.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa81626437---83039482270.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/91d7f8c729c6141e03731caca56badeb/55316432025.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/hm9hpg6ajkd21vs6c0qbti49hd/wuputaretisu.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_off0000d72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72E 11180 bytes
SHA-256: 2a473806f7235171f4e593aae12f3d975894507b1777d4832ca6355fd9871ecf
font_01_sfnt_off0000f109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF109 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001091b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091B 16648 bytes
SHA-256: 5034d50fe40ac7cb2f194db79867bfa875330d26960b77179c731de1db00abc1

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