Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b08ce5254b7c3f1…

MALICIOUS

PDF

80.7 KB Created: 2021-09-18 05:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fc6d1866a4c316d271e868b75ae01e56 SHA-1: 208fbb01986589d7e7c0e8a65ddab3dc6ad1a1f5 SHA-256: 5b08ce5254b7c3f16f01daa0aaa423ad1d91abd814afbbcde8a37d0ad2251c4b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of embedded JavaScript suggests potential for further exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://hotelclinton.it/userfiles/files/94813117000.pdf In PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16143b93b76fe1---jovogulovasexila.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613108f566598---majoxizusedatur.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161305f27a8f6b---detakokimivuxexanipi.pdfIn PDF document text
    • https://worldtradezone.com/userfiles/file/veget.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/3i5k6k362kc4m74co7i1ninsmj/jedepojapesevano.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/481a94b89tva5hutij8r7id877/7694179803.pdfIn PDF document text
    • http://csp.hu/editor_up/12841642423.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/73540927208.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/wewonom.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/96705742668.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/c74f306b938606db0dd4e02775c49cc1/42223681549.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/bukarosutasubep.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/12746047748.pdfIn PDF document text
    • https://bachson.net/upload/file/98155558183.pdfIn PDF document text
    • http://ladna.pl/user_images/file/42138955012.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/xadizutasukokibofepoduxo.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/31262035657.pdfIn PDF document text
    • http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/94313905889.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/wizaso.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/42298597601.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/44848433424.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/46534993539.pdfIn PDF document text
    • http://popmetre.com/news/files/pewuva.pdfIn PDF document text
    • http://mibenjamin.com/userfiles/file/21158696546.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=increase+app+size+androidPDF 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_off0000d81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81D 10376 bytes
SHA-256: a840b2d548681b3e2d06ef99d20d97330aa8aaac3a993ef232df4e8fc5ecaae3
font_01_sfnt_off0000efa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA6 17772 bytes
SHA-256: 99849a03ee8ac5db331e578a1950dc3f33a55bd408a554fe6993d4c5d9640e0e
font_02_sfnt_off00011d82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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