Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac95c4ef48c13b77…

MALICIOUS

PDF

68.1 KB Created: 2021-09-11 02:42:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ffbd0d6a9533b61c632d5277aa25f8a0 SHA-1: e3c70c91bd5df09dc996c0db3669fa76b44ded58 SHA-256: ac95c4ef48c13b7798980010e8c0f2ace35ab0b6ece68083335034bbe8378b6f
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to websites hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to lure users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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 http://usaoxin.com/userfiles/2021-9/file/15381658316.pdf In PDF document text
    • http://smsgurugram.com/miet/assets/files/doxabeji.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613528d43de9f---74438272804.pdfIn PDF document text
    • http://surtek.biz/image/files/20150322_184239.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/63094828623.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/3444940033.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/70406208345.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/41130411658.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/jaromaxujunovawakoziwima.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/69800936891.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/24951217894.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381dd7c7534---29290614762.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/fejorolabokaxixozomidesum.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210911061239734618.pdfIn PDF document text
    • https://pecsikult.hu/files/file/73429676907.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/d7b1b42cd8500cac80a71be80af252c8/fuwoziteruwane.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/zatavaxefud.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/0dca6f85b555030693d95e2eb2baccb9/33105038537.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/zalane.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/xapebakivax.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131587685709---xarukatuzatosogofag.pdfIn PDF document text
    • http://vet-spb.com/userfiles/file/bexulesuvelivijudol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=download+camfrog+androidPDF 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_off0000b075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB075 10508 bytes
SHA-256: f79c9890ea2dd93fb1ce7b505cef2bec888f736940adf7ce494ef1bfc7ecb5e4
font_01_sfnt_off0000c817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC817 14092 bytes
SHA-256: 40011be920b4d76f8b8c9285f3a26de8ff6e226ffb6145fcf43beb6450f399eb
font_02_sfnt_off0000eb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1