Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b9b395a7e9f2dc5…

MALICIOUS

PDF

95.1 KB Created: 2021-08-10 19:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9b3aef718cd8bec1132f68884ea728e2 SHA-1: b75343aeda39413e819a519b89b42d5e2e8d7481 SHA-256: 9b9b395a7e9f2dc5d38c16edf2af68f452361d01dfae669f193ab5d1e765bdac
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. These characteristics suggest the document is designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.serenissimaservizi.com//files/31671832820.pdf In PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1608dc50851364---ridav.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/piguwupigonifomumop.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b009288b9b5---roravojifu.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/dujaxu.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/8869982777.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/34960757229.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/v01vd2ng8coacr3ri6jlaneko7/laxilekegugezuxajiriwa.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d117010364---10476140991.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/85582020303.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/tozarekax.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc52f5bef5---potigalanilopuxojugoxi.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/ziperod.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/d7ae01d119748dab5e06abcbe7e40ac7/22959894541.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/88184411886.pdfIn PDF document text
    • http://ranch.pl/files/file/sedeturifumubevuwi.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5eed55a494---moxugezoremivufaxe.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16081caf0197a7---fowevadilasanujugom.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160e3500bb9264---71935611656.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/4850aa6a050fc07668fc40e459a6d5ad/pazobijabigim.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/fo1rnfb90961c839qkdmtqcsd7/pefelinezivuzosagivog.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160797d3dead8d---63317000585.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/p204artpinl6edta0kgcgfi7ci/nurepawoworavo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=application+letter+format+for+job+in+nigeriaPDF 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_off00011177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11177 16700 bytes
SHA-256: 654ebcfc81cdf7db66a422120efc2a004f6c94f5c21f8aaaf7947ce7448d54c2
font_01_sfnt_off00013c8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C8E 10908 bytes
SHA-256: d095d1fd49ba2e0349c96b05b42d56257da0aafc69aa097a382b8507ea6017ad
font_02_sfnt_off00015598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15598 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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