Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c813d5493a0a6f5…

MALICIOUS

PDF

81.8 KB Created: 2021-09-16 06:35:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3ad009f8b61e09fb411b91119c8163d7 SHA-1: d82e57f8aa511a75385275d7f9b80aa3e0d7b8eb SHA-256: 6c813d5493a0a6f589d7897adaffb60775bfc2ea0f8ac4fedf6eb7d17b7175cb
154 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and it contains numerous links to PDFs hosted on compromised websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a phishing or malware distribution attempt. The presence of a link to a PDF file on a compromised WordPress upload directory further supports this. No scripts were extracted, and the document body was unreadable, but the overall structure and URL analysis point to a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5173

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 http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b6f231f11---48936176297.pdf In PDF document text
    • http://xmzhj.com/UserFiles/file/pikozezirufijitufuvazugog.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/wevuxokasewedopojegi.pdfIn PDF document text
    • http://ranfeng.com/userfiles/file/2021-9///202195217567853.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16140e7d2f341c---4824298030.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/vuzitib.pdfIn PDF document text
    • http://fruitsad.pl/images/file/bagebekepofirexotowir.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/42324394732.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614040bbec4f4---94677205903.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/90374285871.pdfIn PDF document text
    • https://retta-bg.com/userfiles/76414709837.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210902185720.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/32uisa2h9497i04mptrou8ml51/19762088002.pdfIn PDF document text
    • http://jingyitech.com/uploadfile/nagaworebulita.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/jenigina.pdfIn PDF document text
    • http://leeandrewdavison.com/download/xikubo.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/44465982497.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/suxasatigigovanurusiga.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/34744923155.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/87351179268.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/7a5cf0dfd5de14af18897875b7c59048/sozekax.pdfIn PDF document text
    • http://hnyinfeng.com/d/files/14029206357.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=extreme+ownership+summary+pdfPDF link annotation
    • https://rt9.rspo.org/ckfinder/userfiles/files/rufexutajejawilalozi.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_off0001034b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5D 19412 bytes
SHA-256: 68bdb79b3685a9ee373076b0b2feb592191240d7a7baf60c55855ada231566c2