Malicious PDF — malware analysis report

Static analysis result for SHA-256 a45b1d48e8b51a42…

MALICIOUS

PDF

115.7 KB Created: 2021-09-05 11:29:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bde58aa979544593ca314f0f8313c1c8 SHA-1: 821455e11baee578b00e6b184fa753f7cce2d327 SHA-256: a45b1d48e8b51a42b9fad5a95788589c034827bbed93e751ffdb04667e20d06a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous distinct hosts, many of which are associated with compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. No scripts were extracted, but the presence of numerous external links indicates a likely intent to redirect the user to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://duet-czluchow.pl/userfiles/file/mevan.pdf In PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/kn1ba4ki7l938o31vn4mpmkt6l/bowotiveduzuruzodiken.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/56183428358.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/wuwokikerumusakelosovila.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/6c877489e5caa724a360bfe9fa369dae/76942810368.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8eb5ae9949---xuwiligemomizugivuxamipa.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/zurebenuvedu.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/qsqnmf41ou061paenpmmmqeaki/polejonujigaze.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075860e6b823---78834791767.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021060513143539.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/82843587933.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb06fb2d035---juninoxulununobanivivin.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaaab6333f2---36025230730.pdfIn PDF document text
    • http://thegioioto.store/upload/files/gaxefowigosesugixorolowa.pdfIn PDF document text
    • http://atek-ent.com/upload/file/sajukoreropi.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c3f37c490---94322159154.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608321adcc86c---97326004117.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd08d648ac---98537794371.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/25791820685.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/fumulakitosa.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/82045c93d2e6b7a953ed8f0ca75f0050/10291617497.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/d711e7a791f833874f57b970f35ade4b/sazigabado.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/lojifofapiketur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=manual+del+piloto+comercial+pdfPDF 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_off00015b54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17366 20392 bytes
SHA-256: e17dbbbe9ea52a70b0e81a7d6a1a6b8f54774ec4cd508dbd1f6a5b9d02f7bb6e
font_02_sfnt_off0001a71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A71A 10704 bytes
SHA-256: 1d690e128973d49ba70a36bc7d34c6682d998aa5f9941322422927503df0876b

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