Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4b2d1fe0c6250df…

MALICIOUS

PDF

85.5 KB Created: 2021-07-07 05:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c98feaa28166228223123ec796c74ab9 SHA-1: 96ac150f78474c878376942a815678e37e2fb4e7 SHA-256: e4b2d1fe0c6250dfe3cdafa5b0fece510dcb44113d10cf515e16a12e6146bc3f
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. The heuristic 'SE_BROWSER_INSTALL_LURE' suggests the document is designed to trick users into installing malicious browser extensions or updates. Numerous URLs were extracted, many pointing to potentially compromised websites or disposable hosting, likely serving as download locations for further payloads or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://inwebjor.ru/uplcv?utm_term=proteus+8.9+download+free PDF link annotation
    • http://bygreenpure.com/userfiles/file/gexenelixiwi.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/sibevogobuwefogubotig.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a51356bad---58424830722.pdfIn PDF document text
    • https://tsegypt.com/file/42439473818.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/9f1a9d0f82526f36bd6919390e9cf71d/37059480693.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/tefoz.pdfIn PDF document text
    • http://biosite.ru/images/news/file/42504653532.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/dubom.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8531b1607---29246134570.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/3sihoju61m9deuhd5uvni8e9te/kumifa.pdfIn PDF document text
    • http://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/nivusidofod.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f3794f71b---zunozipemebamufoniw.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccdc509f6a2---bifuza.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/razikepemi.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/qjve434ckol8f5dtngsiulu761/81702246180.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e44b46c0af9---xojoru.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/34841649035.pdfIn PDF document text
    • http://smakbyala.com/ckfinder/userfiles/files/85076750973.pdfIn PDF document text
    • http://redsky.tv/userfiles/files/83661708277.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/lojasadobagaxuvawi.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/pewekiguberaxozumivad.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_off0000eafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFA 10884 bytes
SHA-256: 6125a4bd90e2a5fd2dabcf6b5a454b240f25e2bfda2e906b4b41042cf4e59644
font_01_sfnt_off0001046f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046F 17080 bytes
SHA-256: 5646e6349c2bca970c9c1096040857e1e6890b4656b912fd161a7b87f89e9e0c
font_02_sfnt_off000130f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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