Malicious PDF — malware analysis report

Static analysis result for SHA-256 95a3e541ed369a73…

MALICIOUS

PDF

88.0 KB Created: 2021-08-13 21:19:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c26a8582cbbe18c703ab951abf6caa43 SHA-1: bcef96204e61cef139d86b7dea938bad246ab7ad SHA-256: 95a3e541ed369a7393318cc9444055f9123a14f62b836cdd01baccd42b26b91e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, including compromised WordPress sites, which host other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous external URIs and link farms suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://oniceh.ru/uplcv?utm_term=why+does+my+ventless+propane+heater+keep+going+out PDF link annotation
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/44cf67e80723d23531c1825a4fd16abd/tofusutekawilujutujisomuk.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/15466221481.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/94700129426.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/dobetuvaj.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/97107925216.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160796322479d6---dovutome.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/14323871214.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/kekefab.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/38235501305.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/17845777870.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085658c1298f---litelodejate.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6fbc0c0546631ed629a83ac8f5fe03cc/60182705878.pdfIn PDF document text
    • http://dentherapia.hu/files/file/41606595040.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/2nm7ouifspsfuce91esb2jder0/zafezomejajuvifi.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/ae7p35f96bfhpqhvrme92igbge/25225747298.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/beruvupemuwagewebuxotipof.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/77451639111.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/97058864430.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160850488399e8---vusuwimasosixu.pdfIn PDF document text
    • http://balbu.hu/uploads/news/file/89615850873.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/79012d7e228ba58d96a76921560445b0/3201528707.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/65368070641.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607146aebe567---37116637479.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/nubujuperoborisefosatokub.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_off0000f4b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B8 16388 bytes
SHA-256: c59a1c96c5537366079bb78c14275e7093c4d8cb291db778fbdb27a098cdef42
font_01_sfnt_off00011f0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13724 11204 bytes
SHA-256: 3d0dafca62a397ffc11f8370a2b045f4dbc69435e913d8244b6775aeefceb041

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