Malicious PDF — malware analysis report

Static analysis result for SHA-256 a86a8cb067b31e52…

MALICIOUS

PDF

81.7 KB Created: 2021-09-05 05:43:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: c293a4086f4a6e7d7ffd243dd324ae8c SHA-1: fb6b1c5dda9a820a46d9b76b496c65b9872ffe5d SHA-256: a86a8cb067b31e5254c8973a897316953b7301a8a905490d5f73b97858754672
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

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 http://signexpowholesale.com/project-new/christianbook/upload_images/file/toliniwugotusaxeditipizo.pdf In PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608110af080c5---7363650162.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/bupazoparisebebitewa.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/43045536730.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/e00e6a0b8a7271719d8c81104a7a297c/44660607917.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/98c4c1cb6acfcc8e507b49b29a48119a/xeraxesezibajepipa.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/a9af2131b5cf3ad797de77ba0ffdf6bb/vakofinovemiziv.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/db1426b8cda5f63085db1f08cf1501a2/74476469970.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071073c9714f---bezoxos.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/25547966815.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160fd6d3c6be5c---rosozozuser.pdfIn PDF document text
    • http://splogservice.ru/content/file/benobuviwavupa.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aae9ca19d9e---49077435600.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d85432267---65546506026.pdfIn PDF document text
    • https://ecoledesgourmets.com/userfiles/file/7055765964.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/59a4e8dd8930fcfba2be7fb64775cde9/ripororizeboxojaki.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/80061460890.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1c7cb4752---24799526269.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/2580372304.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/85355220650.pdfIn PDF document text
    • http://integrotech.eu/zdjecia/file/96614760836.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/xipuwajaruwisetulobovefow.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/78634314976.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/jikepatuxidajezukasodo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=virology+book+pdf+free+downloadPDF 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_off0000da15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA15 17472 bytes
SHA-256: a47814c44b3b798de66a2de22a41ef72f363a6e4fc1ea290bc4a7bfd1580ad2d
font_01_sfnt_off000107fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FB 10808 bytes
SHA-256: 725dd030ad56420829367b5428a1b28811a0c4cb5ffbc00ba2dc66f4cc1a03de
font_02_sfnt_off000120a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1