Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f9d7ff6d1a768bf…

MALICIOUS

PDF

83.5 KB Created: 2021-09-05 12:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 38a2a08424703f93dc4963792cad1d23 SHA-1: 3b6c2bca1421da81515abe67cd77f3a54ae31a35 SHA-256: 4f9d7ff6d1a768bf24e7dfd3a859896b9e20b682a8bef25ed763f4d85cbf3729
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure. 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 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://queure.ru/uplcv?utm_term=venus+tools+price+list+pdf PDF link annotation
    • http://musiclivemarsala.com/userfiles/files/vajawifuzosutoguxebi.pdfIn PDF document text
    • http://yilip.net/userData/board/file/37688919949.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/38413229919.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd5522386e---bopolutepow.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/zebifiruduwunage.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610458acef589---75103724993.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c2d74a7e4---74064907180.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077afb67054b---60334637916.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/a191da3f8e608e289483e824211f927b/fazekibudupisebijidi.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aea9fe9cca---66241926498.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/6e8ad302d53d110f0245a917a4614968/98820627489.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/romudajowipozifusoj.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/vilureligad.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/f400f3cdd345a319be1524611e8f8328/fojizeremubumiji.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/kuvotudifalapazide.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/kexiwofisupugitobepini.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/tojijusasekivu.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160faf76b88053---jalebuzuvuz.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/1887736355.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bf895ab016e---92456567208.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/xigesimopokademesojo.pdfIn PDF document text
    • http://skupka54.ru/upload/m/vafivezukaxasunetaveduvus.pdfIn PDF document text
    • http://yjccnc.com/upload/files/tofoselifojodu.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210718100510_o9k6sb.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/8448328479.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_off0000dd82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF599 10520 bytes
SHA-256: 8f662defd7f9a461617e0f560718c18fc6865de10c1ae40498f6d589152b63bf
font_02_sfnt_off00010dab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAB 20384 bytes
SHA-256: 8b96a346b27eceeb6bdcedf1dccfaf5a918561926cb8a1fe906988466c796d31

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