Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a0b7520b5d2770d…

MALICIOUS

PDF

86.0 KB Created: 2021-09-17 12:14:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 9b2de1bff01c29fe456860a697656424 SHA-1: 5edac30c379b1acf7e5abb6f7358256e9bf7609d SHA-256: 4a0b7520b5d2770d73507438cf57d1ee020aa43feb647d8060b24ffaede8c450
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs users to open a password-protected archive, a common tactic to bypass gateway security. ClamAV detection and ML classification further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://medvor.ru/uplcv?utm_term=download+game+ninja+kyuubi PDF link annotation
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/3579787202.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/30779058376.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/wudozusupamejete.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/37074392290.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/fdc9aefb80ac989895bf4a7d064d2c04/68045010972.pdfIn PDF document text
    • http://miyisz.com/mingyi/images/userfiles/file/ruwijalenajikudesesuram.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/tonamipexunaguxozebe.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161423da570822---getopekiresobugo.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/fcc72dab0272de1e0b3c55b2ee5c8fa3/nebiro.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecb4793ce5---xakazilegasex.pdfIn PDF document text
    • http://healthywithhart.com/res/file/93208645000.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/kisixup.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/pokufotosowilejeti.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/82502426136.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/liropudamufajuja.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/42940757488.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/861db8ef866575eda867367dbd246043/xiwesenitixutuzad.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16138d76f27cfa---wujosuzuluvowufu.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/29719702113.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/73635483263.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1933f2e07---83471724114.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/e10e74027bc235f93e810de771562c37/wasegakowadiral.pdfIn PDF document text
    • http://seto.cz/uploads/51538906164.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_off0000e5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A1 19768 bytes
SHA-256: 6f3aec92b93a00de9fa26464d0a159f2a5f4da468761ffe83879635e97932e38
font_01_sfnt_off000119b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C7 10888 bytes
SHA-256: 3f0a3c226e57082ebd512f93a1e843823d9d89ebe6d4a4ba55753c33daedd7c6

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