Malicious PDF — malware analysis report

Static analysis result for SHA-256 810fea6cd6e569d0…

MALICIOUS

PDF

91.6 KB Created: 2021-08-10 23:23:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c3517969f021ef86108fcd7cbf51e775 SHA-1: e041d5945f7b7a37b90326641f5868e0b1ba87c4 SHA-256: 810fea6cd6e569d0afcf10cc9af36b24fcd3a4da24d8a002100da2a4f19f8531
156 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, specifically identified as a phishing trojan by ClamAV. It contains a link farm pointing to numerous compromised WordPress sites and disposable hosting, likely intended to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics suggest an attempt to lure users to external scam or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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://catamma.ru/uplcv?utm_term=how+to+mod+pixel+gun+3d PDF link annotation
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839aa8a1e94---87213362330.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/15d0c1318ef3a60ad6fd235c94e352e8/totitaro.pdfIn PDF document text
    • http://srhs1980.com/clients/877094/File/tavoruxis.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926e179e88e---xudodatagop.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804226b8459---motuxumiwojipav.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/gumisusisufixidadux.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/dokiximavate.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/70257643402.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/7c10247c8604384e2f20a6aa40cf6432/76851751538.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160983ed5ede06---dusorupazegavanulesixi.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//35637121686.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b6659eeb347643c2554113e90f9ba0b7/34622182884.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/1d3921c2be8492817bd45c43173e4afa/telebofaj.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/fibuxupib.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/e32664e5963dfd921042a4f81de451f5/44227148870.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceaa377f41---ditokujokesegukikez.pdfIn PDF document text
    • https://premium-house.uz/images/file/ritozuxigojunuvi.pdfIn PDF document text
    • http://npas.ru/pic/file/56328260004.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/31c860a6a1adf5190a5e169a97f7a125/13687546621.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a36aad6d754---90410534192.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b622206c2de---zilepomu.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/kjj0g5ekbpvok7q0uu7r0643h5/98765035058.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de911caf2d---xebitivek.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2a7597ce47dbfe96086d4f46c573ddbd/wiwopiwumenozepowalos.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/32421336414.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a63fa0ecd3d---tonitugufigonorawifujatix.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16071f90a69ae2---jibuxusasatakub.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_off00010156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10156 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001196d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196D 10756 bytes
SHA-256: dc6c0c1f17b6180eeb35b12bc45d1ed27cfed907c6e334c24cd63dac579a320a
font_02_sfnt_off000131ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131EE 17324 bytes
SHA-256: c5eb9852c3129bffbd8a39d5967e56969f7cb47b7fd719e3f42ef4d0f0e1ea28

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