Malicious PDF — malware analysis report

Static analysis result for SHA-256 4194eca2d1336d1f…

MALICIOUS

PDF

82.2 KB Created: 2021-08-30 23:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 69727b060b20be131116b814dfc650df SHA-1: d07330b2c21214264b87b723671b724804c4d782 SHA-256: 4194eca2d1336d1f8a7336572fdcb8442d6a3916fd7a63ab792c64100abcdefe
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using such sites to host or link to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vipnjl.com/userfiles/files/10768192354.pdf In PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/tamuv.pdfIn PDF document text
    • https://airbays.com/userfiles/file/69451661223.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/zozuxivapusuworupirosikon.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/nuborojofemoza.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/masemojewek.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb9226ebfc---remarazu.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/tetuvenosozizetuxamufe.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/41460226456.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/45416853497.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/5f92b2a8fe87518e69ef3d2602c936ff/waxiwerigoxepimatug.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853f454006b---tirolepem.pdfIn PDF document text
    • https://marugame.hk/editor_upload/file/53890770527.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/jibuge.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/kipidibo.pdfIn PDF document text
    • https://reniuved.it/file/zobejun.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/sotimuvabaxeramaso.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75548161499.pdfIn PDF document text
    • http://myshopekerala.com/userfiles/file/rilewepuxidasaleladak.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/26831653817.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/zavapota.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/6837679167.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=100+most+common+french+words+pdfPDF 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_off0000da7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7A 10748 bytes
SHA-256: 33328bc09cd3e306f1d8f4958343ffad720ddd0ce73ac5362f2da4ab9221e7b7
font_01_sfnt_off0000f307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF307 18488 bytes
SHA-256: 94ea6fb045c67642826cbe4faa75312af5cd2dc97a01fc67f618144680c4113e
font_02_sfnt_off00012300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12300 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1