Malicious PDF — malware analysis report

Static analysis result for SHA-256 e89fd487f7edcd0a…

MALICIOUS

PDF

72.6 KB Created: 2021-08-22 09:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 92566b84a8d5fa9a9a01943cc52a4c2e SHA-1: bcf294dc45a00e0fab3a7b84a2989962c8f83c17 SHA-256: e89fd487f7edcd0a96f3fcc1f28520096c77f26f98306bd14ac62fbc5bf822fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that point to compromised WordPress upload directories and disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://synerhu.ru/uplcv?utm_term=felices+dias+tio+sergio+pdf+gratis PDF link annotation
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/ee80a97b1d13f2ef91357a5d1141c632/15720736067.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/2qgccrb7ucjl6cjeh5fi93gvo6/54851694931.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/210807044300070314ralgvj.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608e47f497a90---42030790940.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/89809987193.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f24a780cd---sabizuxosotonubol.pdfIn PDF document text
    • http://carszana.com/image/upload/File/jisesufubikowu.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c08513d2757---66447722619.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/v40qrnohf05csojq4aifgqflm3/tareromeruxik.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/97855052201.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/u6hk0d0kovbs5kmk1ne28alh13/wetutuvupa.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ba50164c957---kemasipodagebusibugix.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc61e0c129---16000188522.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/55202174611.pdfIn PDF document text
    • http://anupbolivia.com/images/files/davarifonebolakus.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/7010960355.pdfIn PDF document text
    • http://hargrovefamilyreunions.com/clients/16272/File/folaketobewasorom.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/dujupipadegali.pdfIn PDF document text
    • https://ismart99.net/upload/files/zogelobaru.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/cks0jinmjbevr3ghiqkknisle6/92568515053.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160f85ead48af8---31732821940.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_off0000b6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6EF 17564 bytes
SHA-256: df033b508278097df41f1e1188a9bcad838c02bc73d8c1129a1bab0c6ca7011a
font_01_sfnt_off0000e326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE326 10668 bytes
SHA-256: cdeac92594c70a05998393b2432d2881fb1de23c0cc335c1e873fece5ab2818f
font_02_sfnt_off0000fb85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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