Malicious PDF — malware analysis report

Static analysis result for SHA-256 4798d5ba851f3749…

MALICIOUS

PDF

264.0 KB Created: 2021-07-06 08:04:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0e10c530ead2fd6aed7e0b7a228cff30 SHA-1: 2f6f869458bae3c597827ac4d4ab2450c6b98f81 SHA-256: 4798d5ba851f37499d7c7c67e0e608aea6d6aeee1ea90214a47499c600cb74e4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF document that contains numerous links pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically related to phishing. The presence of external URIs and compromised CMS upload links suggests the document is designed to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9592

Heuristics 5

  • 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.
  • 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://too.kg/wp-content/plugins/super-forms/uploads/php/files/7c648ab877ac698bdea4d59fff79c263/dunumepemepabakabojobiko.pdf In PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/5d8acbfb1aeb7bccad62b82e2c05f465/93247508387.pdfIn PDF document text
    • http://placc.info/up_image/wagetopidizajatok.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/3ae4d54481f4b471a8ce7a042c0e1881/dadofezorura.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f732854192---wudekatez.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c17d8ddb0d9---vurefizexawexisudojevujog.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074579235eaf---20792143808.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/tigulatimamanovuxa.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/08030714640.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/23825447126.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/d89ce632ec57bedc022aade2a31e87a7/4386603064.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/v353hqspjv0ouamubvgm2c8ulr/rufaruritunovabirote.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/potakokumalitafaji.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/rojewomusivulanigipaba.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608254ad31674---dosomerozokajimo.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/58641102363.pdfIn PDF document text
    • http://hasyo.net/files/file/96082800616.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/54bf579abfa6142f8f0fd10ca813d6f9/tefimijav.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/57f882bf88de90bf62ffc618ed415f74/zimunanagopogefoga.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddf720b7c4---dolapazulojar.pdfIn PDF document text
    • https://sanidom.pl/img/file/kevomo.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d83c7105ac9---20611438790.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/63910868217.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/70216458619.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=sql+replace+stringPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00036eb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x36EB6 20348 bytes
SHA-256: 71e166f6a9c4d1a25fdde427c4e219da6921a21b8429ac9b8fe80882814d094b
font_01_sfnt_off0003a441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3A441 16240 bytes
SHA-256: 5ef7e20c43ec63259c23d22032bd2d0282148239607730cd8ddfa51a9511436a
font_02_sfnt_off0003ba19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3BA19 12056 bytes
SHA-256: d715394c00fa85dd295175f1651015321be24be905317443908d1d79f6bc48c6
font_03_sfnt_off0003e10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3E10B 10648 bytes
SHA-256: 821bd6a401249138e672bce0806764b4b66551753928ac99d43907ae7a5f79b7
font_04_sfnt_off0003f92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3F92E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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