Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec5507defa92bb89…

MALICIOUS

PDF

87.7 KB Created: 2021-09-16 21:27:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d2db273a0ed575b2dea3397a81e3e906 SHA-1: 339ecc63f946e2d8f1641d1b93bc4515daafeead SHA-256: ec5507defa92bb8981b183e0f0fa5adf1ace2695ddf0805b8ece28cecdeafca8
216 Risk Score

Malware Insights

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

This PDF document is flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various PDF files hosted on potentially compromised or disposable domains. Notably, it employs a social engineering lure to trick users into installing a browser extension or update, a common method for distributing malware or stealing credentials. No scripts were extracted, but the embedded URLs and link farm structure suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • 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.
  • 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://lordoptika.hu/files/files/nifazonatobiw.pdf In PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307411bb839---zawelebudozopelasorizo.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/kawexuxitevot.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109022246122674.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210915_25DEF5A92E0CB9AB.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/jawabibemavafunojosot.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/99662702617.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/96831220637.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/mafotuzuxoniwufivobiwipep.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/92242453627.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/76758875687.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/bujanipibubinale.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/52805635767.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/2906j1u47irti2b895midrjc8at869a5/gavejob.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/50224587507.pdfIn PDF document text
    • https://xrtradingfeedback.com/cmsimages/file/46692906899.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/kepubegijimaliduxob.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/76615398478.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/menapurabibututatedoli.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/geguwefixowunazifo.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/94185384553.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/47864099315.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368051c8bec---fimiwovopuvolose.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=idea+movies+and+tv+apkPDF 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_off0000f149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF149 18472 bytes
SHA-256: 0383ef56d8b39f5f970378c18ad1c06f7fd13d6c43377d920dc85b55d7e3941f
font_01_sfnt_off00012153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12153 10516 bytes
SHA-256: 9976d2076975a8e38f6c71f3a2274f4b2809e6fc983bec50614783f94c3647e2
font_02_sfnt_off0001394c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1394C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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