Malicious PDF — malware analysis report

Static analysis result for SHA-256 40b6fc12195ed9af…

MALICIOUS

PDF

102.9 KB Created: 2021-08-05 06:12:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 635385a91ed95e8c69b2650667a0f6b9 SHA-1: 8bcecac6cb72f93fed1e28252790b87f3e27da78 SHA-256: 40b6fc12195ed9afaa4d9fab67072e026157b1176b8e08257df43fbf2cece1fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload sites and disposable hosting. The embedded URLs, despite some being marked benign, are part of a pattern to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705ded649a5---jobubixawefesifol.pdf In PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/xitima.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/zitonetakekibesato.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/f0ncud8v1ntk9u09isb2bh47ji/61136920645.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/39669er12kdhci7derh62i3bj0/98803258099.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/8a7115c7e53a48339989aa525a8ec923/vipowaj.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/32bea64611d22ae494b5da89203ce27d/91879559050.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0dd0b20e6---pubuzopitomuj.pdfIn PDF document text
    • https://smallislandcurry.com/wp-content/plugins/super-forms/uploads/php/files/8b751f30d3662d10e5963ae324389c10/novev.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dfdd45943b5---55883134408.pdfIn PDF document text
    • https://wagaskar.com/media/wagafemadosunilenenolebik.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/3636378429.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/21dc3d8586b24cafbfc0a1a1c39670ff/24313067963.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/jikubanepuzifugulode.pdfIn PDF document text
    • http://songiadahoaian.com/upload/ck/files/vawosofixemajeni.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/rigegutuzaduxife.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/dofureti.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/bapofenafonapunew.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a65335e78c2---91141849259.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bd8507380---lorewepamezilaboxoje.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607216d9dbddb---mogedawovusuxaluripirif.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/nq8jq8tfrkrekb95agmgfo9442/pakesitogunidejos.pdfIn PDF document text
    • https://chptravel.ir/data/file/pinisalokoradu.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/ribibugu.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/jofirivuvenavobafubaket.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=what+are+the+biotic+factors+of+the+arctic+tundraPDF 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_off00012edf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000146f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146F1 17740 bytes
SHA-256: 384677a40d6617d1b7efb3da72ff08e7ff81040d0e86d4da5a0b5960ed945e4d
font_02_sfnt_off000174e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174E3 10760 bytes
SHA-256: cdba9085ba34846093f9d7dbf84370f68af18aae642890b25b334ab891311cf0