Malicious PDF — malware analysis report

Static analysis result for SHA-256 f31bbb84d9b975b6…

MALICIOUS

PDF

82.8 KB Created: 2021-09-20 17:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 24be97f3cd01f5d1ed3a13fcc4f55dea SHA-1: 9ad940e79830b8d18f5f45bb7d85e2934540536d SHA-256: f31bbb84d9b975b6aa0deb747d2e9262414458e09fdfaf9874d4ed07a9e7647e
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a link farm pointing to various domains, some of which are hosted on compromised CMS upload storage. The presence of urgency language further supports a phishing or malware delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://clinicaveterinariamontecchia.com/userfiles/files/vubenusarebex.pdf In PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/34487998328.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/xarisawolusekawikexo.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/93062104547.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/xerunazase.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/xeseludegivavezefuxos.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/fuxatuvujobibe.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/9952c928d82b272cfc360f1070878705/40777640670.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/25572844884.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/39874395724.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16133c1aad85ea---maboxoralikoxuseg.pdfIn PDF document text
    • http://www.llmhospital.com/www/js/ckfinder/userfiles/files/tolofovolonevesomuvaferup.pdfIn PDF document text
    • http://hanauhrova.cz/files/rarufifidirewegosamaj.pdfIn PDF document text
    • http://gucaoyun.com/uploads/file/071420222765.pdfIn PDF document text
    • http://netflor.pl/upload/File/levesodurikij.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/5998702415.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/56080616352.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/zimigagunilaj.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/55153864998.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/tb3kgk3ivng6h8od7ongrvqqfk/nodalegulobunimuvipivopuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=certified+ethical+hacker+v10+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_off0000deca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECA 17980 bytes
SHA-256: aa062ffdcb5bdf45c74e9aafd4072c9b99f41bdf8fef94fca9141cc0a17f7dab
font_01_sfnt_off00010d26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001253d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253D 10688 bytes
SHA-256: 4e25e0687969dca5ebfb79ef55c29951be593df64954394308b63c2ca8077cad

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