Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6215ef19f4afe12…

MALICIOUS

PDF

71.6 KB Created: 2021-09-11 19:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ec2250cac8c77dfef5071f90c8f31044 SHA-1: 7b3b8f009809f760facc05c2b7ff25d1bb0663d9 SHA-256: a6215ef19f4afe1251dc52edb0655b777c56b5fe4ae7152755f82dbdeeeff3c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://coretry.ru/uplcv?utm_term=street+fighter+ex+android+apk PDF link annotation
    • http://camonetinternational.com/files/file/soxuwosupapu.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/ougcj5s0roqfiftckf829r9ogq/sivojavigiwukenofuritenif.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109012134391816.pdfIn PDF document text
    • http://istvietnam.com/rich_editor/file/73545727307.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/50343145204.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/duterutirudexagilefigas.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/lasiramazodofemudu.pdfIn PDF document text
    • https://pecintajp.com/contents/files/dedidavafukom.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/gozesilefokizesexina.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/ravijatu.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/38606549089.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/72067642383.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/16387900632.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/161378f6468648---9490708727.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/tevujab.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/10538968498.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161337024ce31a---87269081632.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a43702d540---26574944838.pdfIn PDF document text
    • https://betsin.org/userfiles/files/89380324283.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/fidegamejepujanezajud.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/mulofologukamur.pdfIn PDF document text
    • https://fuze-pay.com/ckfinder/userfiles/files/75050368894.pdfIn PDF document text
    • https://apra.pl/files/file/67641311060.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_off0000b714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB714 15896 bytes
SHA-256: dce7732707bf744a9f4803a78472d32b18059117b49ea3f6231353eb419d2b6f
font_01_sfnt_off0000dfbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBC 10832 bytes
SHA-256: 3d6d7000480a2172a6282130584bd32d1f50c10ed9ca38d09316bb13466a8054
font_02_sfnt_off0000f87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1