Malicious PDF — malware analysis report

Static analysis result for SHA-256 76108a6e64dd77f9…

MALICIOUS

PDF

100.9 KB Created: 2021-07-07 14:28:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 40183a00185a758cdba9061d266e6970 SHA-1: 745c8a3f9b93f9f1daa1896ca1e6de93757d654f SHA-256: 76108a6e64dd77f9ac18315a1dd53050a9519a4a60ac4319048c1c41664017a8
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites, suggesting it is part of a link farm or phishing campaign. The primary purpose appears to be directing users to external URLs, which could lead to further exploitation or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 https://medvor.ru/uplcv?utm_term=wolf+actual+size PDF link annotation
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/d7e1087f56abf978868f04a7ce77273b/99910530804.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f9f74fb85---midopoj.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8e169b690---15251827651.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8882879ff---kafabedoferamef.pdfIn PDF document text
    • http://ipceurope.com/assets/file/tipofede.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/13553616785.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/76722329088.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff1ac7a406---6868415640.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/popanuzepo.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608807b266107---11146582330.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/zikeluzojeteje.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/36538047654.pdfIn PDF document text
    • https://agermag.ro/mm/file/18913916827.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606da013c28bf---damepinupifesapopig.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/74530945402.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/54838666842.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ef13f719981c61e13b0f16a7c362f95d/86028619392.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085fbf468492.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/f96d4a923b4e9c31002e93f0e2aadb19/lesozitipugazofejaf.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/rixixewonemaloduli.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609586c4dc1f0---sezigizibawatadafuzete.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/7j4qk82sbe1hk4r11n9je0r4kt/54171510330.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5873df115---petak.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/fifax.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_off00012391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12391 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013ba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA8 10280 bytes
SHA-256: 14c5b40ccb3efaa55ab9aafe55a535a830e55bf09aaf82eabbd0c88acf0524ee
font_02_sfnt_off00015305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15305 18872 bytes
SHA-256: 9959f443179b394b1ea965c573a73e7d55aa0f85f024f08f1ee16c6252a27ba0