Malicious PDF — malware analysis report

Static analysis result for SHA-256 437c565b785d4d6d…

MALICIOUS

PDF

76.7 KB Created: 2021-09-02 19:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 353e896ece2606e7b8dbb93422d19b23 SHA-1: 3ee2a068cb8625d8a518318bff2363c68b5e60a5 SHA-256: 437c565b785d4d6dcc7b36f5de4af7129b7bad3f843c7d4c147e9af40223c260
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting sites. This suggests the document is designed to redirect users to external malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://medvor.ru/uplcv?utm_term=redeeming+your+bloodline+hrvoje+sirovina+pdf PDF link annotation
    • http://hyeminshop.com/DATA/files/92393894213.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/89543337578.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/jusazupufe.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1612e64c6a8219---gosusatobiluj.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/61767090226.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/68623598293.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/42510505556.pdfIn PDF document text
    • https://serka.com/serka/upload/files/74813303158.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/85419186986.pdfIn PDF document text
    • http://onellenorzes.com/uploads/files/87868232218.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/13395381673.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/47294060119.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16095097e20df2---gemazami.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3f6169a0f---97001640916.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160871f2bdfdde---85322676943.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/52275717400.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/hp4cmbl5l3mrukr5mopdkkjev1/26399409609.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/a5ff32491d16457d9a3c99fb383b6ea7/sakiketa.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/bklpja8lm9i8pqv9fftvh2960e/5118641118.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/95785575925.pdfIn PDF document text
    • http://immopolignano.lu/images/lanezuvop.pdfIn PDF document text
    • https://anjingliar2.com/contents//files/92240679506.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_off0000c58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC58D 17240 bytes
SHA-256: 6b8ab1e17aa7ca0970a0a0d6ccd7d92369e26f9222aab3f3a98f7f36f6170204
font_01_sfnt_off0000f28a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA1 11444 bytes
SHA-256: 64a1010982ccbf9df6beb4649c47fd6087f7c170055ee4c29eae56a17240acaa

Open this report in the interactive analyzer, or submit your own file for analysis.