Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d5e13110e87ba57…

MALICIOUS

PDF

73.0 KB Created: 2021-09-07 07:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e1b15d5ae9fefc387dc0870ebf8417c6 SHA-1: 9b5f2f718b4a2400ec902117eb9c98717d020594 SHA-256: 8d5e13110e87ba57a5adc256971eb2d300a85035bb2ba41f28f09be6ae585213
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document prompts the user to install a browser extension or update, a common tactic for credential harvesting or malware delivery. The presence of numerous links to potentially compromised WordPress upload directories and disposable hosting further supports a malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://tort-art.ru/userfiles/file/wadexafuborakose.pdf In PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5ce935ea5---vexidiko.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160926b5b0f880---74864060996.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/xuzuwaxa.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/42630198537.pdfIn PDF document text
    • https://egca.fr/userfiles/file/22927751585.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf95d268dc---pagid.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/69649772884.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/43423266525.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/taxavebavaruratudefofe.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/dc339a62ecce761a7e2afe1351b0a61a/8299776248.pdfIn PDF document text
    • http://dallaslandscapedesign.com/media/files/96719775915.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/dcf150f4ca82f00d147e63c55945bab2/61843631672.pdfIn PDF document text
    • http://rotang.net/userfiles/file/45085630381.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4d631f3c3---35974904912.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/disolesexixudav.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/70276169486.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607eef37cfe78---tasiwusegaladapop.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/3as25ntaurvfui1q6l1r4mjva8/zixowovipofudexef.pdfIn PDF document text
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/gibuvukilogogunovu.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-22/20210622224159772164.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dda27759e7---49975853592.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///joxosokitilo.pdfIn PDF document text
    • https://bmat.mn/uploads/ckfinder/files/wekevarivomipex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=gynaecology+by+ten+teachers+21st+edition+pdfPDF 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_off0000bae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAE6 15752 bytes
SHA-256: f2991fa7c6768a57a9c98c1ebda598ff2e427dd6a69242cfcf84449520d941f5
font_01_sfnt_off0000e397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE397 11364 bytes
SHA-256: 9e57b1cd336eec4761143934e4490a785efd03a206905538b72e22f903f4d66f
font_02_sfnt_off0000fe07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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