Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a6b59a619c0e0e9…

MALICIOUS

PDF

84.1 KB Created: 2021-08-27 03:03:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dca5aee7103784e8321ccbeeb10128d2 SHA-1: cbebe54399626df46f1c4f143cf3ac0b579e0f6e SHA-256: 3a6b59a619c0e0e9529c7e9dee9ec0cc52a48e832b78e37bffb494751d705e72
156 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 an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, likely intended to distribute malware or facilitate phishing. The presence of multiple external URIs and the compromised CMS upload links indicate a deliberate effort to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=sonnet+12+by+william+shakespeare+summary PDF link annotation
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160873d40adcc0---mipivuxenotevepi.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607c39fe567ac---jeravuwifiviwifix.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/56904976984.pdfIn PDF document text
    • http://apvn.info/userfiles/file/38984804045.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/67052509775.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/34c0a31711fce5381a3a594abcc009a7/63173411979.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/roxeraxenamonovejojoxuvu.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/ee6c92598663cd79cf3df2fe198f2fe9/pugutonomagipo.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/f982b88c82bdd095a3deeaeff8c2d1ee/17514389338.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/miwefuwegasuwotosugesa.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/65801498818.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/8974184267.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/bapupopunemonunaxejix.pdfIn PDF document text
    • http://narzedziascierne.eu/Upload/file/tivibufexalelodexatiwe.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/xalijudefigeliwemilefo.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160765fe9c1b5f---31991400222.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/52970320669.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/161155e652b234---zenejofel.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///xebefi.pdfIn PDF document text
    • http://clarasonic.com/upload/file/71371973476.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/7289841746.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16085ff0cc8697---fujaropesesifel.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785649e9097---87944320265.pdfIn PDF document text
    • http://rfychina.com/upfiles/files/16272856168913.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_off0000e21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21A 11296 bytes
SHA-256: 2161b4edc5b1b6fcf4ba445fee46fcee24ccfe4abeece20e5ae26e443ff93d46
font_01_sfnt_off0000fc6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001147c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147C 17356 bytes
SHA-256: 077839770c6e27bafa915345d4ff3c95d9f67b03828d76f3572b29dfdf6ed833

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