Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7f82a6ee2bbe82d…

MALICIOUS

PDF

84.0 KB Created: 2021-09-08 03:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d291690c386fa147f67a6ae4943110bf SHA-1: 3d6d6273fd0ac69dea0e8dfd9dc8f38d00627348 SHA-256: d7f82a6ee2bbe82ddcf7a90b2d0626af0e21cb821ea9633e9f38fcbda6586f0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many of which point to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://stockbauer.hu/uploads/file/vudagogen.pdf In PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d95c9ef3318---megusekenemebilokidaj.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-2/20210502073107436520.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/xojogag.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/wulileloretolofuz.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/15fa9a906d258b75d101f1ae52ee33e7/denuxiki.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/45926805465.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608be7929be41---43602992297.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/fmluim139c810pvnp0upsltci4/titisuz.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/f3dd7a7a07177bc287f1cdc12c3bcbc0/17387018320.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/cd487011e7f900f1d572e06138ece8c5/nujup.pdfIn PDF document text
    • http://dollreunion2020.com/clients/4/43/4392dc7a9e9236654a628da0af121bbb/File/femibofusoluwojeb.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-4-30/20210430012836232108.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160969d73971c3---rijamejotixode.pdfIn PDF document text
    • http://msiutilities.biz/documents/basiwogur.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/25799787168.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/fadumojoxanuz.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/59219988011.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/ntc5bmeooljs19uec3pk3b1b1v/85400685554.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-22/20210522001346337519.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/75883040877.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/7163630866.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=small+spaces+sarah+epstein+pdfPDF 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_off0000e2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B5 18176 bytes
SHA-256: 2231928e794c1d753aab13b0ea66cf229a5dd5f78fde9711a9cc75d7800be14d
font_01_sfnt_off0001120f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A26 10840 bytes
SHA-256: ebdebb5741c2017f4322b7f354d1eb4f42c0e61f77579bdf7508051a76f08699

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