Malicious PDF — malware analysis report

Static analysis result for SHA-256 845086090e022a3a…

MALICIOUS

PDF

69.1 KB Created: 2021-09-25 01:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eba539771a5aa9f54d5c1dc408053a95 SHA-1: ca89fbb85784d70dbef29366a7a821e409c55bb0 SHA-256: 845086090e022a3a5d4e6536086708a2b7f9f4a069f0605855618c69bb13b075
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://oniceh.ru/uplcv?utm_term=watch+after+we+collided+free PDF link annotation
    • https://icoachyou.biz/images/ckeditor/files/43202994393.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/72256447267.pdfIn PDF document text
    • https://healthtecindia.com/userfiles/file/73765629584.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/90039646721.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/belavagekameje.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbab35b5a1---fidezulukijebozaxuk.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/5634227963.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/11156616724.pdfIn PDF document text
    • https://majubesar.info/contents/files/taguvib.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/kiwomojulerixofodepu.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e731275135---47711684815.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/kubis.pdfIn PDF document text
    • http://petswithlove.com/cvsprojects/SSK/Source/2.0.0/images/files/88548209339.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210922162640.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210925050116802.pdfIn PDF document text
    • http://gomsuhoangminh.com/app/webroot/uploads/files/wobopuva.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131707dd19b2---94863312196.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/liwitajije.pdfIn PDF document text
    • http://nsck-cykelmotion.dk/userfiles/file/goxumavuresutorodadiminak.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/26716625976.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/52035396067.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/9045795545.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/77094027469.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///37979308232.pdfIn PDF document text
    • http://perfecturology.cafe24.com/upload/editor/imagefile/25766142539.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 15160 bytes
SHA-256: c0fa6520ab662817961225fd69e27705000a06a603ecb2bc549894a2c40f45be
font_01_sfnt_off0000d74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74A 10380 bytes
SHA-256: 02767b274b474bd81773ab4d302737e7111fb2142cbc0d16c62ec7c5944c0e67
font_02_sfnt_off0000eef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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