Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5364979f88b6e19…

MALICIOUS

PDF

83.7 KB Created: 2021-09-03 03:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 604cbb25bac29901d9ac475de17440f3 SHA-1: 2593b87642566d7d3e7384f2dca8179abf3e788c SHA-256: c5364979f88b6e19bb02d2d51d83c56cada8602d183d7c3f9f3fdd8f7fe9300a
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document acts as a link farm, directing users to various compromised websites and disposable hosting domains, likely to facilitate the download of further malicious content or to phish for credentials. The heuristic 'SE_SECRET_RECOVERY_LURE' indicates a direct attempt to solicit sensitive information such as private keys or backup codes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://pfollowers.com/ci/userfiles/files/jositijifaremomobugipibu.pdf In PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/c073bde3911dee158bdc56e975fce6c2/19496912901.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/bajusevar.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160736a585b569---89396647147.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e372f969f86---7434347423.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/e4c17b7d03e6fcdb241bc54afc21f221/xusanagubapexumuge.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/fazopun.pdfIn PDF document text
    • https://ayurmitra.com/files/file/28720439092.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/ce7250c3994c2ecee3d3409fd4fce2c6/29687253283.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/10750546893.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/zavamesofut.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/55469715219.pdfIn PDF document text
    • https://allianztc.ro/files/file/25749870862.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/raropufidofidozanafu.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/31416070656.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/zigasifir.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/80690834169.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bce6a4e59ae---jinonirepusuxopurad.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/sinojedofup.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e881f244d---48088875094.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/b0fcb354e461085624b01cfccad82788/nilinezesewib.pdfIn PDF document text
    • http://lukinserv.hu/file/mafajunozuxonopi.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/xodigalizekilumozorado.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=pdf+printer+free+download+for+macPDF 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_off0000e197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE197 18276 bytes
SHA-256: f6f9677755321b32ec4bf4c6d823ef8e0a6d3e6385ca277a98be240e3b87fc33
font_01_sfnt_off00011075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11075 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001288c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1288C 10700 bytes
SHA-256: 5445b83244fadaf015a93cb0686be8c95727060973bd29fa0796548c3424bcb8

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