Malicious PDF — malware analysis report

Static analysis result for SHA-256 88a2bdaf92d7eb54…

MALICIOUS

PDF

85.6 KB Created: 2021-07-23 23:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7c18b7b90067acaf3c2b50f43c49fdec SHA-1: 11620d44457b59c7961a83620239aad59890963a SHA-256: 88a2bdaf92d7eb54c98ed500c4e47f3623aa388a37ebd8796ca73e28f58575ee
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised CMS upload directories. These links likely serve as a redirection mechanism to deliver a secondary payload or phish for credentials. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://aotwresort.net/ckfinder/userfiles/files/xeruvobevolesixuxewigu.pdf In PDF document text
    • https://kurtoglumob.com/upload/file/22638342457.pdfIn PDF document text
    • http://thaidicattery.com/clients/f/f7/f7b4890cfba443994123e46b8078d6bd/File/tuxigufovefajojewet.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/96c862d815b7af506400056c9e4af39c/94969777157.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1e56f36f8---56359468945.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/juzaxenomibubedudamebuvu.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/e1b6e07de304b1ab9710492cf5ff2848/baxinaleriwizowexeb.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/78689180815.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/lijexow.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/rojizanisi.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/7f0927e538aeda872ab6d01c1cbdb2aa/vakinidobukavetonefew.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/1nm5ul91nokni9uhmb72hcl485/96262918433.pdfIn PDF document text
    • https://klairtransport.com/uploads/files/11699401939.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/54171747694.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a947472201---63212367244.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/99505749251.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/joxewujixod.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9663d8f6c---19075653278.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/47418487308.pdfIn PDF document text
    • https://nicosiacaffe.it/file/bojalokobabekukof.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/160778a565d3dc---siwanirinewo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=streaming+film+the+boss+baby+2+sub+indoPDF 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_off0000e938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE938 17128 bytes
SHA-256: 64d1c805673f75b5ff4c85d7715d8557f590e348283169b406d114313b7b7cc7
font_01_sfnt_off00011610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11610 11348 bytes
SHA-256: 9aa548c0ee728c9c9b80583de6248f921a403a6a220beffcdc2dcacf9a69079f
font_02_sfnt_off0001306d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1306D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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