Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bd5f7ea79005f96…

MALICIOUS

PDF

84.3 KB Created: 2021-09-02 16:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 074295f666195cda43bfe00e3cfb153a SHA-1: 01d723cc38f17abc28a22ccc84d96f53f9075041 SHA-256: 3bd5f7ea79005f9625ccfa92e60dc8d8a635856fced48c85f99f84a3de019bf4
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 websites, likely to facilitate phishing attacks or distribute further malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, suggesting an attempt to leverage SEO or compromised infrastructure for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://philabc.ru/uplcv?utm_term=ashta+siddhi+mantra+in+tamil+pdf PDF link annotation
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/588be70e6114d952f515207bb24576d4/40669781679.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/7dba5a7db74d3261640308c9665b4e89/bitojax.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/46683284324.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/h22mm64kv73gnm0hibars9nqak/tazosilinilige.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/4383445ce1c8670629635d3c762b14f3/safeloxenoge.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c94b2d9f59b---lufemorerave.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160e8178b090a5---18395531384.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/13445761821.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611907a647b2e---44679897712.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/gaderiwinasagas.pdfIn PDF document text
    • https://2acontractor.it/images/file/41481644367.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/16676511934.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/d9m6ggf3cuguf6s8ibhgaiusdu/51628011433.pdfIn PDF document text
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/6a665bbe78588918fa1ad1426688244e/mironutirokalujip.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e3ddd0243---sekodalovufaboxurilolitu.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/2021717628405206.pdfIn PDF document text
    • http://ranagro.com/files/koxulugiv.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/lavowoxujokalemi.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/3fe6b6c6b21e71940bfb2131ea9eb791/40441543063.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/33766198967.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad28ff45079---32889984365.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/wibaxiv.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/68416771769.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/63714425935.pdfIn PDF document text
    • http://rivucota.com/upload/files/xawivofatuwabo.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_off0000deb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB4 20368 bytes
SHA-256: a52505a587f677b79ac15135faad6f4cde8ac9b2fc508dcc01d7ab2b57ac6908
font_01_sfnt_off00011375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11375 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8C 10492 bytes
SHA-256: 0b637b099b1ddde6951ae180f7f6276e70ba9397eb812eb2758ce50875fa06ed

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