Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ba5ae19ac92ef61…

MALICIOUS

PDF

69.5 KB Created: 2021-09-24 16:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5970f1573bc171055e08540d95df47ae SHA-1: 6648b0344e1b72819ea4e95104dbe0a856291aa9 SHA-256: 6ba5ae19ac92ef616012957408171d50d90ef911143447553fbc8a30c5657458
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://drafthe.ru/uplcv?utm_term=best+blogs+in+the+world PDF link annotation
    • http://adbrf.com/files/fckeditor/file/2095925970614991f949490.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/kuvirikaxum.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/xuputatugonik.pdfIn PDF document text
    • http://zenithmetals.com/files/12626488806.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/luzufajotuserovum.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/74603104424.pdfIn PDF document text
    • http://onlineauadms.com/ci/userfiles/files/letuwetudegawesup.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021913846504980.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/xotufemikevegimadesa.pdfIn PDF document text
    • https://testagenda1.myagenda.cz/pictures/editor/files/51345348978.pdfIn PDF document text
    • http://vps73.juicy-group.com/editor_upload_image/file/vujidulowevitamifiwukif.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/915e58f31b98046428ef4ce92eb567d4/81729409825.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/jdhpuad4g91ntiplcvvais3sn4/wabomes.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614994996e47c.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/17853572832.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/bibitufelivub.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-21/20210921235748836975.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/87071743494.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/24556485661.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/zujuvilipe.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/bivemanetebazufe.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/69579770864.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_off0000b0f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F5 15568 bytes
SHA-256: 82735e1e356a24ae77bff12ed549e0423a906613ca26e96bb919145b54b243d0
font_01_sfnt_off0000d841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD841 10644 bytes
SHA-256: 3ff0d954fdfaa6e6a60bd8e22af256ba1fb41320e954833a5f973f263dc1ad68
font_02_sfnt_off0000f068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF068 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1