Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f6dfbf90d34d189…

MALICIOUS

PDF

85.4 KB Created: 2021-07-30 16:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 130cf6e4cdae9809fb9f8c1efa7b1fdf SHA-1: 44c34e43ec52092d59da81277be4acedc6fa1360 SHA-256: 7f6dfbf90d34d1891a9cd2cd06e9ab6d9123b83ace695b389e5259334d365096
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, but the presence of multiple external URIs and the 'link farm' heuristic indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/c223e6eb80766e2a26f17abec185b925/rifadofo.pdf In PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/c6ae09c85bd2be569bf940bf48b73250/41794808424.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/kofoguxosexiguk.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/1bp1sltp22s8mmrto1t7242v21/64516263788.pdfIn PDF document text
    • https://humicdp.com/uploads/2021-06-25/images/files/20787041210.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/89873444647.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/35692906667.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866ffd4b4cc---dasuwini.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/pesuwugovudujo.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b40b8a5fa---38046120904.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/bedubunowevixesaxede.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/22443106063.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/42d7e658534a1f8d53a799fb7f398486/vuranajalaromabeti.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29083875110.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/36443b0ff5388a75081e11fcdc53f2c5/16410788292.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/8ff1ea7fbf6368e0934cb1d5b8a0fc44/94252659621.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606d99cfac441---nedeno.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/91601133833.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/01e91de88930d8a56cb292ddcea0dbe2/79814668346.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/b95b215a776b8dc891216de6a6abe22f/jarerovedamavapozikilusa.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/jimiduliluwazixonidetaxe.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/55200211852.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/bimokawutetovexabed.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b70d93aeb6a---82102099297.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+pair+heyday+speakers+togetherPDF link annotation
    • 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_off0000e793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE793 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAA 10804 bytes
SHA-256: 2f7038e181de62a0ccc1c6bf10724d32735e91a2514ea9334e3f2494e2e752bd
font_02_sfnt_off00011897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11897 17020 bytes
SHA-256: fb4ae1d6d456c830fc02fa0ba65abfd11e97013f6801f14c892c6ac993f49ba9

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