Malicious PDF — malware analysis report

Static analysis result for SHA-256 f25d3d8262b9cc81…

MALICIOUS

PDF

69.8 KB Created: 2021-07-04 11:59:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2dbc2179234d7862802a4e1ba3bb2185 SHA-1: 08a3f148c1ac0f66aaf1bf67671dab4334b65dc6 SHA-256: f25d3d8262b9cc81c5d9d110ff2d854cd767d489255c459e1619f1699b856df5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malware. No scripts were extracted, but the structure and URLs strongly suggest a malicious document delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://pixomot.ru/uplcv?utm_term=100+sgd+to+idr PDF link annotation
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/b27531e2ddfefb537375dcaecdcc0a21/32129841690.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/90436206029.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3ffd2ba0d---kolewamuvazin.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/muwiteko.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/4d4704548b1e184b0cf363b18b81b24d/desedulojugopofoviwuwunev.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160b6128bf14d1---88433484202.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096bc650a78d---kolekewema.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/f9e9e5da5d635c778529fe25949e1625/kavamuroloferaronib.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b803819f093---fadofiga.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160aea81d0ee80---6530455494.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/d6ccu86s02g6fit94i7r2626e6/26319095853.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/luqkd2f6c9dh67qiioalu2r9k8/96937320986.pdfIn PDF document text
    • https://securitydm.com/slicice/file/nebijaxelipomibigake.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/72507821071.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/17e8f7c1fdd97226fee1c4a08ccbeb3f/85645551278.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2740d343e2---gadatakedapajalepesedu.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/modizebozazadamegugalama.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/93408702013.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0575320fc---gifuti.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6dc2ece06---welapixija.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/rj3537njcfisn2kdsds9a1tht3/75679266572.pdfIn PDF document text
    • https://farmstead.tw/farmstead/upload/files/mekodevujurejimegosisug.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/6548671c61e48aec148a30190cee998e/warazejokogidabofos.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/72fc9f6074c587ccb5daa1f4d916776e/56197833777.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_off0000b4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F9 10056 bytes
SHA-256: 4667e4ca9839b7472002fd8d69500e8e81e7d593b74f5ddaa3c623902b5fabaa
font_01_sfnt_off0000cb26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB26 15536 bytes
SHA-256: d7aa7b18934813a4e1fbae7019388bc7d6ea99092310fd48f856fa0d42c73957
font_02_sfnt_off0000f246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF246 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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