Malicious PDF — malware analysis report

Static analysis result for SHA-256 a807c214b6c95b8f…

MALICIOUS

PDF

79.7 KB Created: 2021-09-11 02:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 31fc5a1a7cb57d4ef59da53d835a0c48 SHA-1: a9eb305dc26dbffc47979e4359b1874bab2af51a SHA-256: a807c214b6c95b8f34a2d4bb0dc614216771c59d5e96a1aedf650c311e74a6e5
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document exhibits malicious behavior through social engineering lures. It prompts the user to install a browser extension or update, a common tactic for malware delivery or credential theft. Additionally, it employs a callback phishing lure, directing users to call a phone number under the guise of resolving an issue. The ML classifier and ClamAV detection strongly indicate malicious intent, and numerous embedded URLs suggest a link farm designed to redirect users to potentially compromised sites or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://coretry.ru/uplcv?utm_term=google+android+contact+number PDF link annotation
    • http://all-premium.com/user_file/files/14966410510.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/nupalizenuto.pdfIn PDF document text
    • http://scarpatti.com/files/41162437736.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/sinaposexunevakuwaj.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/61898878464.pdfIn PDF document text
    • http://aquatherm-graz.at/files/69927257989.pdfIn PDF document text
    • https://morethancars.eu/uploads/edytor/file/kewilijeweditanurowizov.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109031334034221.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///wolijojovujexezazulajafo.pdfIn PDF document text
    • http://taxfreepoint.com/file/96535167883.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/24200457565.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/xokepepotobesolaboxax.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/10866513548.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/ip8s74m6g7avb0skvi92fgu7je/46024583291.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161353e42f3166---84573537424.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/58495011804.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6bedae2c2---newujenofopom.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/fasabofagodelope.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/xilise.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/nuwisunivebidelufuwokaji.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/debuzo.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/supapakedenaxunujurexa.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/3493186976.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_off0000d4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBA 16932 bytes
SHA-256: 6061f6dfc784b04fde2a38c07c206725b6db0133075ee265dd3d1c3c72e0c92b
font_02_sfnt_off0001186f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186F 10824 bytes
SHA-256: dcc762b23d4977f572ba6e46394dcc4165351fef33a0368c009f2d7f6dbef518

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