Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4f80a464c520632…

MALICIOUS

PDF

78.4 KB Created: 2021-09-06 16:26:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4cccc034f37ef5c939005e028ae4c26f SHA-1: 744f44d16940ef4cb72d20465de567cdef3c450e SHA-256: a4f80a464c520632c6693817d101353462ba7fa443c9fe3b165a98b375cb58f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The heuristic firings indicate this PDF is a link farm designed to redirect users, likely for phishing or malware distribution. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://oniceh.ru/uplcv?utm_term=les+miserables+easy+piano+sheet+music+pdf PDF link annotation
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/hqr8vdk93e01gmtlnqven05tdb/70620169922.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/98701651927.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/885c8aaf3762c98c9bcee3d0f4027a51/13837421809.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/saxubixig.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/mabisizurizopezisezipilap.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/pedas.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/c15cf96120eef9cb16875dba4d64914a/garope.pdfIn PDF document text
    • http://alkanboya.com/files/file///dewepisep.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160724425473f4---16938154911.pdfIn PDF document text
    • https://afayl.com/userfiles/file/42425970468.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c324fa10595---jedatudaxeginusurosomew.pdfIn PDF document text
    • https://www.haievent.com/wp-content/plugins/super-forms/uploads/php/files/3suu0ninjb6vv05j1kapfkuidp/75668608660.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4de66d46f---14291254123.pdfIn PDF document text
    • http://fpsh1980.com/clients/7/7d/7de5299bd6bdc19cdd6b275c058e9c4a/File/redinoli.pdfIn PDF document text
    • http://hopkinshigh1988.com/clients/75739/File/51581542760.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/betm4i8kgnelurbm8p7mjnegc4/70433565929.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1627829850.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/tovowugevup.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/tukusu.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/pajekekitolojin.pdfIn PDF document text
    • http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/nolikume.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/11454177149.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/40686902710.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_off0000ce8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A1 16952 bytes
SHA-256: 5caf5cfd78b643503e589e1838fb55c76df6fdc970edb04633c4ea71b9b7d1b8
font_02_sfnt_off0001119b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119B 11196 bytes
SHA-256: fe13ff56ec9899ac62889dba137ac484330d661de45fbac35c485dd4b841e19d

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