Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5b90b0d68d5e35d…

MALICIOUS

PDF

81.4 KB Created: 2021-09-11 18:56:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6b1fa82f41edb42fb1358b806cf678f3 SHA-1: 70366e9b03bc0851e7d1ebdaeeb1dedf4e9cb5d7 SHA-256: e5b90b0d68d5e35d898ad444cf21e6ce67b158b4ad5ae04b0dc8c6a94b1123dc
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/94041782200.pdf In PDF document text
    • http://sfalojistik.com/userfiles/file/rumoduxo.pdfIn PDF document text
    • http://spakimthi.com/upload/files/2732617643.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/jamuw.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/bokijezosavetiwinuvo.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/55265107050.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/buzobo.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/paxit.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/21930659427.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/29119635781.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/20576994211.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/welalidusefu.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/mebosizabazuvu.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/48431644127.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134cf3100c3d---rifupujovodumozaw.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/34341841387.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a905fec028---87638095659.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/kiwusowuvafuzuveguro.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/40cd031982c5874632e0249c0519b957/49499556605.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/39336915735.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362a32cd6e7---1094156229.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/xifubosewodukabo.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/14911112813.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=live+net+tv+download+apk+4.8PDF 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_off0000d81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF030 18220 bytes
SHA-256: 7589f80c202102348b2051a9c98caaabd67896f81142173e21ced112b241c6be
font_02_sfnt_off00011f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F34 10672 bytes
SHA-256: eec5cb73f623b31e66be9ff7298521a3dca215cd069b9b433212c429c2a17b45