Malicious PDF — malware analysis report

Static analysis result for SHA-256 c699768640fee161…

MALICIOUS

PDF

82.8 KB Created: 2021-09-02 09:08:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bb5e527f70e4348c6fca8d175d66ea69 SHA-1: 9d189bb751e34cc7c7014689acbebd415fdf3cca SHA-256: c699768640fee1615cd9bb23ededc2454d61f4841d9c4e677752ca3db8622d6b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress installations. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://infrive.ru/uplcv?utm_term=a+crossbow+is PDF link annotation
    • https://directorvincentchow.com/fck_filemanager_upload/file/digoziwunawibufixuv.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/08-25-19-43-38-31.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/85718539414.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/l4dijqnulvr3nkmabr1713l4cq/37124926388.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/c202b51dd88fc59f78e2a142b5654aad/wavigixumadinevowujusawa.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/91502009c7a2a66be49e28d1fbc9fb6e/sokewixuxujobakanerov.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/wawupidinemozut.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/puniwaxugufusupog.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/41852311905.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160799dda46d23---55910719975.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/96417290440.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/setemevukomadejutexowuku.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/80886208824.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/cf4378dc1fce71105913da990e12bf5c/mixavapifarakamawemeduwap.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/71851402291.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/nu2d2j31b2brrvub4e0pdso7k1/71533681545.pdfIn PDF document text
    • http://www.conectadoscomdeus.tv/arquivos/file/jajenawabolisiwawojaroriz.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085e88709816---66727475188.pdfIn PDF document text
    • http://hitmet.slektenkaas.com/bilder/file/46010957396.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/rimuvosufoxej.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/e60efb5d331bb8fe2d65a99d1b453f93/pumuxezobifogupigogu.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cc8b81d2e8c---78953555498.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_off0000e2a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A0 9888 bytes
SHA-256: 021fb7a969389f06bac492e4cc5cb4665d5db795db8dbcf1eef0be49f558c87a
font_01_sfnt_off0000f895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF895 17448 bytes
SHA-256: 5df4034b3282605834d76604a23df5f118ac397af777e115ddf75d927de8e11e
font_02_sfnt_off00012588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12588 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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