Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1fce350d1af2a35…

MALICIOUS

PDF

87.4 KB Created: 2021-09-11 18:58:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e14c1a2d33da4e1dbca86f7edee0f86e SHA-1: b15d21bc3ddf74394bd08350d1e73f008a0f2ed8 SHA-256: f1fce350d1af2a359da359fa3ff5f15f87bf2ee8184cd073cc6072828eab0a26
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. ClamAV detection and ML classification strongly indicate malicious intent, specifically identified as a phishing trojan. The presence of embedded JavaScript suggests an attempt to execute malicious code or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://irlanc.ru/uplcv?utm_term=shapes+activity+for+class+1 PDF link annotation
    • http://otpetye.com/images/shared/file/weriwikazuvitagemasavebop.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/42273859757.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/68595302446.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/ragixixurusezejenuwera.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/dowaziwuxiwif.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7c9fd839b---garuzibibo.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/2672695767.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/20219932308803.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/mitoj.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/q05nj8648augaqj65jdcntl4jj/98207431837.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/lukatutafi.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/26044852.pdfIn PDF document text
    • http://euhoca.com/js/ckfinder/userfiles/files/legoloxepapeberarezoko.pdfIn PDF document text
    • http://tctrack.vn/images/newtech/files/22072017745.pdfIn PDF document text
    • https://resicolor.com/upload/files/vuritepefovuxovu.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/49168974151.pdfIn PDF document text
    • https://forumsevens.com/images/file/sabez.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/dekiverazadava.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/72487648111.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/63583980673.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109030049339602.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/82r79en76rnb1b5ag0ece5r0qq/66385669298.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/32387817377.pdfIn PDF document text
    • http://koutingchina.com/upload/files/41962959302.pdfIn PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/liwozigumajodasafosizaso.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_off0000f121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF121 17640 bytes
SHA-256: 7079d924f9997fbfe9a6c4830022c6b4c836087d7702c459115f6f8157d5ed41
font_01_sfnt_off00011ed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED6 10780 bytes
SHA-256: 0eee1396e2a74c1733fce58b3dac246678b0c444dacef424031438fad96d0273
font_02_sfnt_off000137e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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