Malicious PDF — malware analysis report

Static analysis result for SHA-256 13bcf1735164108f…

MALICIOUS

PDF

89.8 KB Created: 2021-09-06 03:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 737694a755051dd989d985d7e2ee6a65 SHA-1: 5f54753f590a8bba10065d5057c12e041f95b766 SHA-256: 13bcf1735164108fb2a956e7ea9e98380b50b5d910a061111db2658a0a72a778
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous external links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the link farm and the ML detection indicate a high likelihood of malicious intent, possibly involving JavaScript execution or redirection to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pistant.ru/uplcv?utm_term=class+schedule+planner+pdf PDF link annotation
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9c5a7076218f40c0b172bc980e082644/kanapiruro.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210608101349.pdfIn PDF document text
    • http://www.bandungmesin.com/file/libuzujavawakosox.pdfIn PDF document text
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/qaanbdp6t71qjqtl16asuo9lae/73731901990.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/64280827363.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/n22ltd0thapq4137uj1ajrbk6c/penetebujetusuteg.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/80072731425.pdfIn PDF document text
    • https://vzglavniki.net/data/file/16517175975.pdfIn PDF document text
    • http://nineslash.com/user_file/file/28770013037.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609045d328141---50430801332.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d991d43149---vapamuxe.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16105d59c142ca---95595161272.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/74926109268.pdfIn PDF document text
    • http://giaphatmed.com/upload/file/nejigajegedinokev.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/rimuwopozexosileg.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/68480397683.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/5759a8091d1961a724ce7eb10f0d495b/4445016187.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161353f612b591---wemuxeviparudidebijan.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/gugazixakiwamifinexo.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210724022244.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/gufumowozevan.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/69583576709.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089d5444f87d---25550571305.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/11137755848.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_off0000f945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF945 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11157 18544 bytes
SHA-256: cf293e98e51ec0071f942ffe05c61a8e083c2901f5ecdcb87529efd87aa5297c
font_02_sfnt_off00014178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14178 10536 bytes
SHA-256: c7be450761ccb0e07b2c73d2c3e3343e372f4f4d1be2e482e2f296e8ca640916

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