Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b63999bbe8cfed9…

MALICIOUS

PDF

80.0 KB Created: 2021-08-08 07:57:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 702d9bc5bbc2a44673c2c41f8d806a56 SHA-1: a32a92484963468375b0a05d3bb506f1b9c641ed SHA-256: 0b63999bbe8cfed96e4c561d68635eca30a490fe40719726cfcf1cc03a658216
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be compromised WordPress installations used for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of external URIs and compromised CMS uploads suggests the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://pistant.ru/uplcv?utm_term=calculo+de+varias+variables+james+stewart+4+edicion PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed8eed4d3c---13707493235.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/rakumupumozukimexirivor.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/19990962572.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74b61103ad---losotobobetoso.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/12224357111.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b15441767b7---199851546.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e5130349a---witaxuvedonul.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/jetebelezek.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/3oi98tglan0s361ublqe3sttvp/wimotoveriberivasu.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcee8265b8---gebomifago.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/f3f3aa2e80fd8dc2f73057f989e68bfb/86040522112.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607230250c4fd---xezegowumedesipe.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105fd74c8527---67110018506.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac41f297b2b---xopibakifemobuv.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/40b233aa35c07d229e14f338d1147731/95717767153.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/negopoxifivafiret.pdfIn PDF document text
    • http://ksuskalology.com/images/file/86602911459.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/79805634333.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/4s0pden9uasmg86dn8l2dn0cl6/16047757779.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/kemikavanekezoni.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/zudulapibe.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16073732218170---12775894368.pdfIn PDF document text
    • http://anupbolivia.com/images/files/jelefaxukukatatiga.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_off0000d176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD176 16996 bytes
SHA-256: 849ca2598ef9e0add77a1868918078df90bcb0c0d6f6983eeb2358c56fb7c748
font_01_sfnt_off0000fc87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC87 11160 bytes
SHA-256: 9885cbdc5efd8c4d49aadc7b80df696f55e337cbb01b047f9a961d81cf7f522c
font_02_sfnt_off000116b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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