Malicious PDF — malware analysis report

Static analysis result for SHA-256 72d6a6f7e2fe14e3…

MALICIOUS

PDF

80.7 KB Created: 2021-09-16 20:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: afa72ac05680b14c0d711ffd1be71270 SHA-1: 5fed0317afa42b40885f002c541106bce42869e3 SHA-256: 72d6a6f7e2fe14e3d7cb73f672096c845b84898b371b355b8d5bfa581b668c91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://queure.ru/uplcv?utm_term=samjin+company+english+class+full+movie PDF link annotation
    • http://railwaysrailroads.com/upload_files/files/39085169018.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/f8pujbrafsvf9s1akate8m2na5/25469891564.pdfIn PDF document text
    • https://ayurmitra.com/files/file/25412995767.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210902_9B68DCDCC1A251B9.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/47069274002.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613f880b6588f---74644424907.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/sapote.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f35213d037---xejebisig.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/82c5feb94143017307c4d8b0ea32b3dc/4032623751.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/1192603379.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614293a9a1db0---31312176546.pdfIn PDF document text
    • http://ckudzcssffhhj.handysociality.com/upload/files/39685199964.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/pasujenewemepojopetezama.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/gazivazuxilusuvo.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/m4qg97rtobihep2bnic9gvvu9o/92310369750.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/52760614231.pdfIn PDF document text
    • http://tfforming.ru/d/files/60435466843.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/putubifiri.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/70911189086.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/dakonudibifazijenokuv.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/xapagevadinudufifolewifol.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/2478655511.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_off0000d16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16D 11216 bytes
SHA-256: 35fc034d53d44e7d90494d6675766357ad6394a79aa98c3257bd8cd5706a2834
font_01_sfnt_off0000eb6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6A 18856 bytes
SHA-256: b4923bca502c40d344aa6d09a59d9e6510d02f27b54bae8fa9f9d7d1e685bcaa
font_02_sfnt_off00011cb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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