Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b0eb8f577c0ab60…

MALICIOUS

PDF

85.2 KB Created: 2021-09-11 03:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 34d47aec32e73f549d61ffd8dfb8ba77 SHA-1: 279e4cd9dbe850a0e3247522a777bf24b3c811ae SHA-256: 4b0eb8f577c0ab60e23812d6f62639985393846d0889f4bf333fe9e279fd5003
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' lure and callback phishing indicators further support a malicious intent to trick users into downloading further payloads or engaging with fraudulent services.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=ps1+emulator+android+games PDF link annotation
    • http://bestbelly.org/content/files/files/66967532016.pdfIn PDF document text
    • http://dade666.com/userfiles/202109file/2021090704323170554.pdfIn PDF document text
    • https://nieruchomoscikomercyjne.co/files/file/rixumimelutodumovezuduru.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/rigoloja.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/19b2d731db6460646cb0df145dbd15f5/38542802738.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/tovisipunafowataviluzisur.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210905_D90697DF728A336B.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/padirovuguzuraxanejadar.pdfIn PDF document text
    • http://mobil-tech.com/files/rulozegopanefogov.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/20652080888.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/gemidokuwukomaw.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/dopewepujixekebamiv.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/debovapejas.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16137195498fe6---73706393095.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/86018683409.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/36328876226.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/8b709fc28aae956aa90c71910d349a6c/43105219203.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/44260049652.pdfIn PDF document text
    • http://starma.pl/files/file/kunepepaziwekatenezegir.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_off0000ea83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA83 17300 bytes
SHA-256: 504fa5279f3b13d5530a6754554571fd352ece115fea21ec60b353a5977c6236
font_01_sfnt_off00011756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11756 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F6D 10744 bytes
SHA-256: c18db5dc6d7399df505971dd0f0162e845d17fa430eb539a8306f67176611079

Open this report in the interactive analyzer, or submit your own file for analysis.