Malicious PDF — malware analysis report

Static analysis result for SHA-256 9554b08849c1ff2d…

MALICIOUS

PDF

70.5 KB Created: 2021-07-01 10:32:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1201354146bca1cf651f5eb2176b3756 SHA-1: 081a2932302444df72034bd6b5eda3b6d45f4d92 SHA-256: 9554b08849c1ff2d4d6d74bbe1f49ecfd7d8a0c54bd8903ffafd5df21d2665a4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely to direct users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://huntic.ru/uplcv?utm_term=captain+america+with+thor+hammer+wallpaper PDF link annotation
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/cvikmadb1fu8b4j5tk9ojl9996/34326454770.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/21970178338.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16078401ce9989---80496207490.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2b6dc159b---38245350582.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/be3kea238fng3qvq49va4vsguf/71234944169.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/topada.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609898d138819---51945252698.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/savama.pdfIn PDF document text
    • http://polletnv.be/uploads/files/bukiditetuxi.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/19be12bb92336739cf4dd44574fc6ee5/56630050406.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/33609206871.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b399695d452---sarosopekafogof.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/8255281661.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/62def1608b50c94c349ca6477651696f/vanadikubera.pdfIn PDF document text
    • http://donghotam.com/luutru/files/zuworotukizituxur.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d0d0ccd19---sibejapibejuvekevejaf.pdfIn PDF document text
    • http://omak1968.com/clients/71178/File/bewazibuwase.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/0il3ta35pf95h15f663k84fmlb/1599924164.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070298c74d13---57628150589.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/67832591198.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/33401017916.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c60739f3050---werepusilose.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_off0000b5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D5 15100 bytes
SHA-256: a00f68621b9627573f9c2b05213e27327726a99b8cf7e541d969de71267ffca1
font_01_sfnt_off0000dc75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48C 10588 bytes
SHA-256: 7fea0b4dcb75da498aed3da3e7fafaafb888e33951f9214bf8766ed94a7fc3e1

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