Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa731afe2dfa2725…

MALICIOUS

PDF

84.3 KB Created: 2021-09-07 21:15:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 612b2a63af6afbc521b7e9a855efd115 SHA-1: 09f27671e1cd67cdc634a4a060ffc883531551af SHA-256: aa731afe2dfa2725a60cdef16fd1dc0f52e26065d707c2d39d526f7dc5f5b259
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The document body is unreadable, but the heuristics and URLs point to a pattern of redirecting users to potentially malicious content.

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://www.arborvitae.cz/ckfinder/userfiles/files/15553685779.pdf In PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bae5ba8dc2d---93858822652.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/87563491531.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078135832ae7---48241412233.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/83341847529.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/loragopeda.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/guvisogegonew.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/nadibusojogasalo.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607197ff7e24e---16058845381.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/12644355285.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099d383bef5b---67202220456.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607b40eab94d7---koname.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/voretoto.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/16443928660.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202107200442024823.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9678f2789---gefubuwo.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/15749411443.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/megipemulopenin.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/28261753485.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/45761345683.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/40072544292.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/wibaxiv.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160d28674694a7---12384216823.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=hertzsprung+russell+diagram+worksheet+answersPDF 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_off0000e3d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D9 11168 bytes
SHA-256: f233c8183c63ca0fe4c2ea7f772ccd7e1d470dadb5fefcf1f4ecb83ea4665bd6
font_01_sfnt_off0000fd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AA 17256 bytes
SHA-256: 1368b2153183cecb2602bb771479a66750f02586f0b0f202678c61190140b58d

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