Malicious PDF — malware analysis report

Static analysis result for SHA-256 360740860fa6a098…

MALICIOUS

PDF

88.9 KB Created: 2021-06-27 11:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8bbf00360c5489712c8fa6de4c6711aa SHA-1: 6b57c832edf4dbd27700e7dab794b62482077a60 SHA-256: 360740860fa6a098fc1a86377c36e7122cb8a37cd674e678069b025e6f788961
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and disposable domains, suggesting a phishing or malware distribution scheme. The document body is unreadable, but the heuristics strongly indicate the PDF's purpose is to redirect users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://smidgel.ru/uplcv?utm_term=black+aphids+on+pepper+plants
    • http://bio86.fr/fichiers/depoporojosexekufifusa.pdf
    • https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/nanilirabilaxineboxopapes.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/7472cdfc3301d6e150b2c7b175cd0ce9/85460160331.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b726ab2bcfa---rupafanobifok.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b0fbde3a8ed---dolanibi.pdf
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/r9q7mc9ba259k9eanpkv8hmov4/2656382105.pdf
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/487c694a9afad0c0d7d064f108f37464/38744630932.pdf
    • http://tafgambiatours.com/userfiles/file/jixaza.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/a63714f23aa6df4a02d3a7c0cc605078/26546780951.pdf
    • http://sahamit.net/userfiles/file/nusodaraxujurexab.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/6428bf9342174ec5677326bfbcb1ad48/60442826211.pdf
    • http://longvu.vn/Images_upload/files/rivok.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/7804q5a1kmsvu3ftidoi7pia00/wulabim.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f56de2c2c8---nobetakabizesobewagukinu.pdf
    • http://camel-republic.com/media/userfiles/files/80300176699.pdf
    • http://archi1919.com/smlclub-files/file/kesolopekejuwizolezasuruf.pdf
    • https://szekszardportal.hu/userfiles/file/guxiti.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e71bb8bb55---jezetow.pdf
    • http://dunajecbiala.pl/upload/File/kovogetazinabolevawe.pdf
    • https://muzeumkonstancina.pl/attachments/file/zemedefafimeparutidobej.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4b08c8bfa---xatevavu.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/8b9bb6d0323393daf02e18550953e64d/kamixe.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8e5.bin
a75100e6e849aa97b274cb94d186080fbc2bcb2804e8a0d1c40faa4829770484
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E5 17164 bytes
font_01_sfnt_off0001259e.bin
268e31f4ff119d2cfa0fcbbbbcfab7352d149932b88a3ad243f350fa0d497963
pdf-font-stream PDF embedded font (sfnt) at offset 0x1259E 10756 bytes
font_02_sfnt_off00013e5a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E5A 16792 bytes