Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc77328dd972cfc8…

MALICIOUS

PDF

74.5 KB Created: 2021-09-12 19:07:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5852f8667af0f5364940a76ca4e33bad SHA-1: ba1d1e111a7bcd901415089352baf14fa7a93be1 SHA-256: dc77328dd972cfc8412b704ec1336dcb8d3e1914a9a91fd1af41e5c17833871e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://thestarbusan.com/FileData/ckfinder/files/20210903_B6D6C98EC75F25F4.pdf In PDF document text
    • http://amsaneeraus.fi/userfiles/files/79581906330.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/xasimaxurofawizojivize.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/momefajabazusuf.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/65785023044.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/senikamelis.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/58475917174.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1613066c31ef93---zigej.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/jixalekifixupakaxanokuk.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/nokegiza.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/e562ce4431353440fe6f12c39637b326/46934248457.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/31042217054.pdfIn PDF document text
    • http://omni-links-europe.com/images/blog/file/dusoxokoruxewuvipamifo.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/97312060360.pdfIn PDF document text
    • http://gabortech.com/admin/file/26433649128.pdfIn PDF document text
    • https://sona3elkhair.com/userfiles/file/kaxujegafudujazegexixux.pdfIn PDF document text
    • https://tiemhoamo.com/data/dulieu/files/39021888892.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/36939317946.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/859583fa9e19b1759e0d638287a21d7d/47132798581.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/julidagologi.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139b7185b8e7---50202349055.pdfIn PDF document text
    • http://chinalabware.es/d/files/sunosedomitanuzodu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=digimon+adventure+psp+isoPDF 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_off0000bb2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB2F 18304 bytes
SHA-256: cb9643d989ea44e52dc0807ec2e8a1b0604b920f425585818cf9de97f2844884
font_01_sfnt_off0000ea63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA63 10856 bytes
SHA-256: f82d4663c464c55e03e042be1bc148a73d820ac3370511deb059342c879fc6d6
font_02_sfnt_off00010348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10348 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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