Malicious PDF — malware analysis report

Static analysis result for SHA-256 b576e5b05fb2be23…

MALICIOUS

PDF

77.2 KB Created: 2021-09-01 08:34:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 078fd453fff25da4b2d30f2a3ff1b5bf SHA-1: 8ae6752994d28eec2506481bdc84d2126ab4944a SHA-256: b576e5b05fb2be23abd74f216bd60237edbb4a6620313b67596d83449e3ca890
154 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 contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and link farm heuristics strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7561

Heuristics 5

  • 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
  • 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://crysiq.ru/uplcv?utm_term=tech+jobs+you+can+get+without+a+degree PDF link annotation
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612bf3e48d159---82869734910.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612bd7f53ac83---17876977845.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/ifi2fbkktiekpvd48raj9jvq6g/bazebatew.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/342c562b522be34e8c6575435d6a10d3/46551102361.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/a4e1rlknjt28lr6r4goc1ffkl3/34599036299.pdfIn PDF document text
    • https://olterus.net/contents//files/luvokenubigur.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/73946532018.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/sozogezap.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/23080561520.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/81428127630.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/nizexitanidufidorevu.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c785f9c4f8---58224085503.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/89298505851.pdfIn PDF document text
    • https://littlelightnepal.org/userfiles/file/99054202644.pdfIn PDF document text
    • http://liily.jp/upload/file/20210818153005.pdfIn PDF document text
    • http://leilehua76.com/clients/4/4d/4d80c013f15dbe3c797666a457780dca/File/772410979.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/7a1d13c96e8014808016e8dd897ab70e/63798744002.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acee16afed---36560162740.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087da159bcd1---ratifenukelu.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/b9c0b1ac43d079104cdeb0277a9c4243/35280903039.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091eacb6eb2d---nesuzitapirajomokofu.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/28098637132.pdfIn PDF document text
    • https://cooperspick.com/files/morugekanijoj.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C6 17112 bytes
SHA-256: b962fa835b1ac6f961c0c6b804517f0e2ce383d2e46fef1c7abf451e15d98ccf

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