Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5a7841958211b63…

MALICIOUS

PDF

81.6 KB Created: 2021-09-06 08:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cd476bee2fdca3afc8a2cf07a1d7e9f2 SHA-1: 85dd8b85eafa4a66e59e3414bfca7372fb38b5c0 SHA-256: a5a7841958211b63dc67dc5bd19ee3fa7917c533cc43b4c43335bb0b959573fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external resources, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attack pattern designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160831ccae37b0---79257608779.pdf In PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/gupufejabilibejokuronuj.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609baba242106---51493243103.pdfIn PDF document text
    • https://mimpishio2bet.net/contents//files/bunukazigixawexak.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/fc6211990e3e93831b5c2d765b9246eb/sububel.pdfIn PDF document text
    • https://banghenails.com/upload/file/37637262978.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3975759cb2---podekexop.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609948394bc81---gonunuwegul.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/wawerezegoxazagulix.pdfIn PDF document text
    • http://toyotalongbien.org/data/dulieu/files/resozulozutozipifuz.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c734b471ffc---dunomuz.pdfIn PDF document text
    • http://worldwidefilipinoalliance.com/uploadedFiles/files/vosumetozugatorakowudewo.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/66568040527.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/bc6f13a3d8c74411e8ac97322aa645fe/zeworu.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/15738811859.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/72792842703.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/61607262360.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/mewarufojuvuxi.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/94984286482.pdfIn PDF document text
    • http://gurolmumcu.com/userfiles/file/sixirewuw.pdfIn PDF document text
    • https://nistd.in/userfiles/file/dijiwipan.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/40258168848.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/3b8e64d693a87b481dbf2926d06b8235/toraforulerozije.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/xedigawafeto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=dled+lesson+plan+pdf+in+englishPDF 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_off0000dd7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58D 16804 bytes
SHA-256: 1e2504847e7c17de8d2bd1ffc1b1ef6fb9240261fe4a066ff1ac7407e64af1fb
font_02_sfnt_off000120dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DC 10580 bytes
SHA-256: cbea91ff7e9db1d4373c0c5f1e017a8eb53a3663046cdafd58244516450fa903