Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc15f6974df0f5d3…

MALICIOUS

PDF

83.2 KB Created: 2021-09-10 15:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d20e9107014a2b24fbe7935797bb539f SHA-1: 4b363c153f273fbefcd43b4de54464dc4f3ec386 SHA-256: bc15f6974df0f5d32a8c159c2241f19e697ceb7708ce77233f07f3069739e4be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm designed to distribute traffic or host further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically suggests a non-clustered link farm on disposable hosting, reinforcing the phishing or malicious content distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.ez4parcel.net/upfile/files/2021/09/10/tesizotidaferoxajenig.pdf In PDF document text
    • http://bienchidan.org/uploads/files/16179453927.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/bivad.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/10542832749.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/3f4199daa7e46933774946674711ec00/20451503793.pdfIn PDF document text
    • http://istvietnam.com/rich_editor/file/12064644906.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613431d893594---lukolizixovinoxapuwa.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/87664923698.pdfIn PDF document text
    • http://domplus.su/userfiles/files/46653638249.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0d281be93---2773154378.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/vupitedul.pdfIn PDF document text
    • https://cecprint.com/images/file/55610796114.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/vusokugawivasetese.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/zalad.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/89055141557.pdfIn PDF document text
    • https://vnycc.com/userfiles/file/jugejijelodemenivogurozip.pdfIn PDF document text
    • https://u15.ch/ckfinder/userfiles/files/43286926064.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/48466999113.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/zeved.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/76402438114.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210906031141741825893.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/pumowow.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/22262748994.pdfIn PDF document text
    • https://nexusmediation.nl/files/94887918214.pdfIn PDF document text
    • https://kingwrapcarspa.com/upload/files/sekoban.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=popular+themes+for+androidPDF link annotation
    • 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_off0000ddf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF0 18636 bytes
SHA-256: 9a5803189063de48d94fe6e4dcb369e8889e34baa31de9fa414a94ff35106f23
font_01_sfnt_off00010e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0D 10864 bytes
SHA-256: fa556827203639f3e5154245afea897807aa3a453991adfc45eb0ae392c90dcd
font_02_sfnt_off000126fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1