Malicious PDF — malware analysis report

Static analysis result for SHA-256 6510c4188d0e1ca0…

MALICIOUS

PDF

79.2 KB Created: 2021-09-01 09:04:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f2ea832095c41b24e261ee2b61bc531a SHA-1: fe21b7cf7ecafb4cd346f3b1f02401c6c2ea2471 SHA-256: 6510c4188d0e1ca003c6da2d954dfbf1432a274a3beddca6ac28c5cdb6500d16
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and disposable hosting sites. These links likely serve as a lure for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://rdmsrl.it/userfiles/files/39420803323.pdf In PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f16461cc0---kifiv.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/1lq77g777b1oqm8vtre0nf1fi7/99383246981.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/qentktf6g58v0o6r874q6pjsfu/jilobiditusewumumi.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/fenibofodexifaragevenejor.pdfIn PDF document text
    • https://jurad.eu/files/file/23272770973.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/34630277352.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/75035218557.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/uturk1r808v4mgrtoieish5pe9/xoziv.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/9915571430.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5d6c8ef66---buwufodugaxif.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/safj8q56usojb7u0gj0qiffr1a/puvinarugutib.pdfIn PDF document text
    • http://adbuffalony.com/uploads/files/mofux.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/58388520838.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/56785603728.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/40041e603ff5b13bbff6da0b800d7c8f/tovagawufazoxalazis.pdfIn PDF document text
    • http://chetaomaynganhnhua.com/uploads/files/28383935888.pdfIn PDF document text
    • http://ligneus.hu/upload/file/fofokutowezekibokezisus.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085cfb2c8bef---gixozugivojobe.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210611_87C7C71453111BB7.pdfIn PDF document text
    • http://toflight.mobi/attachment/ckeditor/files/2a7573b665de41a52c85e32553b85ec4.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/24025146967.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=driving+lesson+manualPDF 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_off0000d11b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11B 16992 bytes
SHA-256: 084393aff9984d4e8f1758c71041749e10ce8efd9a306393194791c5e75bd7c2
font_01_sfnt_off0000fd08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD08 10520 bytes
SHA-256: 812dca73bc54db370970f56144c3aa9ff12d43218441d10bafcc45cac941fe0f
font_02_sfnt_off000114f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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