Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b8de500776fdfa8…

MALICIOUS

PDF

69.6 KB Created: 2021-09-02 05:25:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 36e23419e021cfd6dc90e3a4c938bc88 SHA-1: bedf46134b7da4ef54251fe5b1de693612394072 SHA-256: 8b8de500776fdfa86dadf3b365115568bbcdf26f4e8f7f457e2d1d7ecd4847e2
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and embedded URLs point towards a phishing or malware distribution scheme, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608679c38fb5d---tepeg.pdf In PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/21922325527.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/17995174792.pdfIn PDF document text
    • http://flomojapan.com/upload/files/ximujopa.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/lavizuxorativujoke.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/33675491021.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717be3cef47---6501691245.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dabopi.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/eb0b920aa88a26025ca593bb07598875/natiresi.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/4065c8786a6af92ae14fb15d0ac39a5d/logotireja.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/zijiwefimaravanapunu.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/bifidafutaxejomedefepevo.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/57630640259.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161206ab9102af---63345940947.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/75190019665.pdfIn PDF document text
    • http://haai.org/upload/file/wutiwir.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/305444517.pdfIn PDF document text
    • http://grandviewheightsalumni.com/clients/79364/File/48519001772.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/59139299604.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85dd468a51---29479284888.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/zukavukimolidule.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/pisifipemokete.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d45697d02---37200291352.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/27139668176.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=treatment+for+blood+clot+in+armPDF 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_off0000b258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB258 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6F 10572 bytes
SHA-256: a8a6e739ede51bf5356b96916ef0d6eb19e6109f3e62e4177e4f7c5198ed48a7
font_02_sfnt_off0000e278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE278 15084 bytes
SHA-256: 73c5f908bccb57de4322e1efad5dd07a6875ce669321421c4d0dc1fab18516d2

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