Malicious PDF — malware analysis report

Static analysis result for SHA-256 31ff53a6d7a61742…

MALICIOUS

PDF

84.4 KB Created: 2021-09-10 11:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e747c2cb8f4c73540d3dac64f2c5748f SHA-1: e096064bccfef4429995c98798cf7e1a83004f40 SHA-256: 31ff53a6d7a61742fc40c68932795b7c227b424bb013c2bd9e30c9cd84c54d23
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URLs, many of which point to compromised or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or trojan delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://sbsoftware.ro/admin/userfiles/file/29092172477.pdf In PDF document text
    • https://tcremich.lu/files/files/punavolinix.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/kibugikedanezovadujese.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109070023485459.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/33129136362.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/28102890672.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0ed00c410---85090588886.pdfIn PDF document text
    • http://steinemann-ag.ru/90672631672.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/74595995763.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/91427193870.pdfIn PDF document text
    • https://la-klamm.org/Files/files/36385594223.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/63786547241.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/givix.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b18a8c224f---71977056953.pdfIn PDF document text
    • http://esen.life/userfiles/file/92571301603.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/zotedotisogobuzavuvo.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/86172109765.pdfIn PDF document text
    • http://axwelindia.com/uploads/97107943277.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613641d92a6d7---vagawewejobiburuguseje.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/98250872078.pdfIn PDF document text
    • https://binhvi.com/upload/files/munelujopuso.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138a3d27a200---60966578907.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/pirosonegukogalunanem.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/6336440135.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+clear+android+memory+cachePDF 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_off0000e5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F7 10656 bytes
SHA-256: ccdbabecd5c6b67bd79ac1f16dea7382d85445a26518ab62f857f26425560a9d
font_01_sfnt_off0000fe24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE24 17900 bytes
SHA-256: 0b880b1a75942478684f9283dd549695c155ece8ee3faaf63251efe78a6b4523
font_02_sfnt_off00012c07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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