Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7743d37256c6075…

MALICIOUS

PDF

81.3 KB Created: 2021-08-18 20:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 89cf695d46b9bb5a194f30644b6d6a4d SHA-1: e99340446a975d9ac49aeb977d2abe3ee81d15e5 SHA-256: b7743d37256c60758970e6b5de058c170613b7b094f361854b8937073f927f3a
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, specifically as a phishing trojan. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host and distribute malicious files. The embedded URLs and the nature of the heuristics indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e6412bcb8---vojeritewetagegepufip.pdf In PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3dd8c9c2d---naximavotivovadasapexame.pdfIn PDF document text
    • http://deltools.com/userfiles/file/19712618976.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/48d48b3ef497af3ab4be11d3c490cae3/befafaj.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/79511364582.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/21940028373.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/nanowajasokixemaka.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/10853662239.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/nesagokadakisojinuvufixa.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd0306009e---movolore.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/87976267685.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/52721486062.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/15693063887.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/soxujidudus.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/v6bmh9h1ofo13auf7r4hkjsg0q/nasonipezavogesikuput.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16084996655cb5---dobojimopezuxodumanesi.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc42243667---fuxunojopogawobimafumala.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/76393465604.pdfIn PDF document text
    • https://webmenuplus.com/images/file/91975524654.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/zuxug.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/somovifuxota.pdfIn PDF document text
    • https://derey.nl/app/webroot/files/userfiles/files/22268482127.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/67117954424.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d2d2d3571---takugutuwaj.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/bimisebekapozas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+process+a+ppp+loanPDF 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_off0000d990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD990 17432 bytes
SHA-256: 3f8fc9c9f214b3a21ea6c431c9f78da2c964d078d45c6f723b962e7a4a0c6dc1
font_01_sfnt_off000106eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EB 10352 bytes
SHA-256: 4f7c54c6bbb07e6cbb35dff532d7e72ece5543f5442a97d82a9c0ca8ebc23afa
font_02_sfnt_off00011e80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1