Malicious PDF — malware analysis report

Static analysis result for SHA-256 d714268e2a4319c7…

MALICIOUS

PDF

90.2 KB Created: 2021-09-19 10:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4e672759402750b15380e72a8e6a1638 SHA-1: fc50eb0ce81b4eb7f8a599242a7c7b9800005cf6 SHA-256: d714268e2a4319c70699ddb59f951fd68463da85782ceb187c5ed2182fb45292
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external links, many of which point to disposable hosting or compromised CMS uploads. These elements strongly indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=zero+to+one+bangla+pdf PDF link annotation
    • http://cascad-trans.ru/files/kaluni.pdfIn PDF document text
    • http://ilkconstruction.com/Images/Media/files/povisa.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/konuwibiwad.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/miburugojefirad.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16137835e38a59---36922757119.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/5806425563.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161367d9575432---juwosedekelurefemujoxarok.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/sepifafimexamu.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/11712866931.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/xoramabunuzosevumowo.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/xaxolurapux.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/85706497719.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/95245254679.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/59631495474.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/47115806172.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae38289663---mivenut.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/161394068a9c0e---17188825858.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/lajizuwigesafak.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16146cc29cacbe---dodapimifikorenu.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/81707635693.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/22650530370.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/69407246498.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/59374052972.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_off0000f2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A2 10516 bytes
SHA-256: 8e273edbd0b9be824d6949937ecd47ace953e3cda72c60e72614b9cd9593d32f
font_01_sfnt_off00010a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A41 21840 bytes
SHA-256: 2ae5aff66fbdc08d0733abafe1f403ed007f1cf121bde9053d0af0ee74810e3a
font_02_sfnt_off000143c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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