Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a9e9afd738e177a…

MALICIOUS

PDF

83.9 KB Created: 2021-09-13 12:27:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 135767de3d8f997f17419e9602a61112 SHA-1: 6aa2e0a1c6b7080ec1f57c780fdb26f6452ca6bb SHA-256: 7a9e9afd738e177a76eb54ea964213236cb03ab97491b8d9fc267547912f9ce5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to a variety of websites, many of which appear to be part of a link farm designed to obscure the ultimate destination. Several URLs are hosted on compromised WordPress sites or disposable domains, indicating a likely phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://archism.ru/uplcv?utm_term=o+teclado+do+android+sumiu PDF link annotation
    • http://hotdeals24x7.com/ci/userfiles/files/webakamib.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/sorerudofejulosezenezev.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/wawuvoliwobapupamikalapar.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/bejibaz.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/40298334447.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/64985109333.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcc32b8db4---90367208511.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/ilfpaifk2dk567v5ufj0sbe5i4/damenirupeko.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16131120b145c1---muvumigazo.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/dasemuvawuwewigekid.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/msmk5ml6agf4b5n6nd05tljvd0/17613595188.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/bbf9b7cbc7431a429380cb9ab89a9263/24745037964.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/vesibemobotumedijawof.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/89517330868.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d0ad7257c---fevovivazemedusidi.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/wifufiju.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/neguveniwubukavasituza.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/lawometitiniratibokug.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/tozoruvekez.pdfIn PDF document text
    • http://foodchemsino.com/d/files/tazejiziwizinog.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/kubotivipuminatodapofet.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/wefijawarepufogosolu.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_off0000e281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE281 10656 bytes
SHA-256: 01575cdc35107303b09f7b45711526fee3086df7b0ebb51628bd59f71bb54a35
font_01_sfnt_off0000fae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FA 18428 bytes
SHA-256: 41774c47729f3e036975c0c9f53daae86caa18353f36860b19410a6aeefbafa4

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