Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ffb58e0d95b2408…

MALICIOUS

PDF

68.7 KB Created: 2021-09-13 02:26:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 629c56e9b2acc827b53856b2391f0abd SHA-1: 9199167eda2ccf0b5bc7b9ea33250af0f9344414 SHA-256: 0ffb58e0d95b2408c4d78c9d0e8e29b894a17fe55327e29829d918bb72792739
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure and external links are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://ketchas.ru/uplcv?utm_term=android+12+update+download PDF link annotation
    • http://baugeraeteverleih.de/benutzerdateien/28920874116.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/pilutadabekelipaduvinomaf.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109121757005160.pdfIn PDF document text
    • https://777mto.org/contents/files/29237020696.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/65467356457.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0fb7a196b---laleten.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/23277921018.pdfIn PDF document text
    • https://newfrio.com/userfiles/files/fekaxuf.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/firazixaj.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/76803111567.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/91596334495.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7f9c82ed6---53728870106.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/45693082057.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/gaxusunadafegik.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/22630051461.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/vasakejuzogof.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8a22b497f---guxavafefimedolab.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/murawuv.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/glv8apr233omt6sr7o7bmvhra6/99809421287.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/84871713012.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/3ecdnbm7klta6bu20resqvkt9u/82031042454.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/14998104691.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/migapuzozujewuxip.pdfIn PDF document text
    • http://vntattoosupply.net/uploads/image/files/dororifulofajanunomes.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/kunebubap.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 10556 bytes
SHA-256: 2d52e632b77234b62bb6153a04b8cb299c765b75123ba7b28497240d5a23d584
font_01_sfnt_off0000c948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC948 14304 bytes
SHA-256: 215a251e7852ccce307e88cf8fca1aa56666b1d6fa20ab46e2377a33dfafa2c9
font_02_sfnt_off0000ed2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1