Malicious PDF — malware analysis report

Static analysis result for SHA-256 8192643c2194ed0c…

MALICIOUS

PDF

86.9 KB Created: 2021-09-11 21:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5e51c023e7a83f5d7cb9dcc822f7bf52 SHA-1: f034a0c57ef8b0a5b8a8d02ff1c893596cf80560 SHA-256: 8192643c2194ed0caefd6e13c44ff9ae3b161214a9aeb62e9fe2050356964af7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links pointing to potentially compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

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 http://daisytalavera.com/userfiles/files/kezajomalakakidop.pdf In PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/27365988586.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/oknq73hb75ove7pnbir1bbgacp/95203807113.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/bofadizevezusopedolenev.pdfIn PDF document text
    • http://taigesw.com/upload/files/josofufanovejevunix.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/71168201406.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/derawuvo.pdfIn PDF document text
    • http://idcla.net/upload/files/82525042139.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/17981929914.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/zafokamanugazo.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/faxulipijajorewixi.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/90467406072.pdfIn PDF document text
    • https://conrays.ru/f/data/62892868535.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/35666820077.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/xesusimarixadin.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/dawifevaroben.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/a90b33abb53fd8d02105e40e9762530c/borodixepozidekiniz.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/mumipisafesigavopene.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/tidif.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/sipojexufawat.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134af6d7762e---47570289414.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/73808509487.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210908064749117.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/10249303290.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=mr+robot+season+1+episode+1PDF 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_off0000ee66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE66 18308 bytes
SHA-256: beea1f74c5a6e38c9cef1b55c4bf711e1070de5b4f5cfed329f01c8e56dba304
font_01_sfnt_off00011dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD5 10524 bytes
SHA-256: 19c609ac06783e29cbf136f487083f2d5e2fc5665a0d9c845e7e1a91f91357a3
font_02_sfnt_off000135c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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