Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b33657c89424b90…

MALICIOUS

PDF

75.4 KB Created: 2021-09-05 02:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c6516fa4eb18113eeb509b0d66a4f77d SHA-1: 3a118409a8764f23e9fda2217f859a3d935c3ec2 SHA-256: 8b33657c89424b90ecb5fc19c88ff4dfc8baf4fb82b77b5f71ac54676b8c7a23
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of numerous unknown URLs, many associated with formcraft plugins, further supports this, likely serving as lures for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://tuttotop.com/userfiles/files/gulukajiletatoxutobi.pdf In PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3338c53be---bowazokef.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/xerosowivuziraju.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/waxonilememe.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d15897b91---12519390660.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/kifobosoboneje.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fe317b978---23237869123.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/23050321742.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/31195530057.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607de1a974e49---41987836800.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/libojajozunaberap.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/gatepuwu.pdfIn PDF document text
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/bibidiparinujuduw.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a953200ae89---82590287728.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/20779502727.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160914e2277dd2---xepedeleledavawa.pdfIn PDF document text
    • https://reinigungsfee007.de/wp-content/plugins/super-forms/uploads/php/files/ljbefirhnotomunl95qj4h95b2/66568584781.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210727_202014.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd15eee7ff---zodalironevogevawuke.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/28061704505.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/tajumitoke.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/fanusuvavojaveje.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/wujixijedixabe.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090205424c0c---62325058162.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/natovipalot.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/kowomagojora.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=safeway+job+application+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_off0000c6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B5 10892 bytes
SHA-256: 1581e15a0e4f11fbd01676d441d65fcb8e132dd91e505d672db09ceee12d046f
font_01_sfnt_off0000dfd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD7 15588 bytes
SHA-256: ae2d2ccfd458f5b39a81b6eac534420a63ae3c8739dc5975ffb5e2d05fde1c8f
font_02_sfnt_off0001078c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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