Malicious PDF — malware analysis report

Static analysis result for SHA-256 856abd113f4309e1…

MALICIOUS

PDF

72.5 KB Created: 2021-09-23 22:22:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a793052616015984e6dcc74c57d31bcb SHA-1: a82c7704ed798844e14ebe7e92126b5e2877ee74 SHA-256: 856abd113f4309e118beeb2476b69b29dd8229ec6fc943b8ebd3e3e923f40ebd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest a link farm intended to direct users to malicious content or phishing sites. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kaithompson.com/userfiles/file/4553826749.pdf In PDF document text
    • http://amirafouad.com/uploaded_files/file/xokowuf.pdfIn PDF document text
    • https://plasy.com/uploads/file/22409439906.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/desafamarezixirutari.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/67165527164.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/49755417212.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614afd8757dc9---riketokedumuzikanige.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/84457567475.pdfIn PDF document text
    • https://www.allduniv.ac.in/ckfinder/userfiles/files/7448092408.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/52949263160.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/xupirovitiveruwefes.pdfIn PDF document text
    • https://trieurodata.ro/images/file/46606089159.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/wusewokojinigimebepu.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/57398201741.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/buwet.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/59400986744.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/27669225746.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210918010859.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f4aedb64e---fadedu.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134405f24bae---xulalikodimujalunixomupu.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/jopijugabukibofarilusu.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/69396784347.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/wedarisuz.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/miperabur.pdfIn PDF document text
    • https://combrooncom.com/contents/files/pezoruguwizukuvalanimul.pdfIn PDF document text
    • https://rinducm1.com/contents/files/pizunagatevak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=spirited+away+english+full+moviePDF 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_off0000b6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6F1 16516 bytes
SHA-256: 0a92a6d4ff0565729e6c71e6126e7b0987d4c9a0da54a4505c068a0c4ea89c63
font_01_sfnt_off0000e11d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF934 11388 bytes
SHA-256: 7867b55cafd3201e8725bf9cbe40a5902f1b2b954ade3f25b345bcb05077de94

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