Malicious PDF — malware analysis report

Static analysis result for SHA-256 a83b167481487e17…

MALICIOUS

PDF

104.5 KB Created: 2021-09-23 14:22:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e50a6ee08068aea865c3ee2617e8bd49 SHA-1: c92b39b5d0ed99320da134ba30bb6cb99bd45770 SHA-256: a83b167481487e170d066c05abfccc642e50079613f1caac80a8d5c3a9439ae5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing users to multiple external URLs, some hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the structure and URL patterns are consistent with a malicious document designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://bouwbedrijfansing.nl/userfiles/file/nelonunumiviv.pdf In PDF document text
    • http://donghotam.com/luutru/files/rijutowemi.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613214dbef9af---65472073593.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/85407344407.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/17817984048.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/pasevujovi.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614006ba4795f---13988405132.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021091523584673499.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/98889951271.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/05b1829545bbd4db6e6dc358747ac688/bujuzodilalitorakoxabunel.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/zozanel.pdfIn PDF document text
    • https://vleek.com/uploads/files/tabigikoguxisusaxube.pdfIn PDF document text
    • http://cbafjvn.com/uploads/userfiles/file/52650423218.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/41615679383.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/kubepiruvifedi.pdfIn PDF document text
    • http://halmar.info/userfiles/file/sajarupag.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/vorasolakivuxipetid.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/jafesamepudok.pdfIn PDF document text
    • https://snf.styleguides.ch/userfiles/files/67382870217.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/ekmov7eh0mrop0bcaqhgod8nm9/nuvenanaxigelowesebe.pdfIn PDF document text
    • http://aspit.ro/imagini_ws/sozilumaregifanusisopu.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/87837380003.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=namaste+america+for+androidPDF 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_off000131d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D0 10568 bytes
SHA-256: 2b0cfd3c5032046632ace3afa5028485c0595d0c0cec15840877d792282aad57
font_01_sfnt_off000149ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16201 19324 bytes
SHA-256: ddab801329bf91b277b8f096b7a4abce1c9887ab66e20876e8e45fcd31ce25c3

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