Malicious PDF — malware analysis report

Static analysis result for SHA-256 b89fc5338a658bd5…

MALICIOUS

PDF

80.9 KB Created: 2021-09-18 04:11:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e52420275186f7bed1f812f3411baa30 SHA-1: e457eb2db8c2c85bdd4b6262a48292a56e96c78c SHA-256: b89fc5338a658bd5fdbffcadeb685e50a4ae55daed2e00f2f7282dd9b1142e82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable domains. The embedded URLs suggest an attempt to redirect users to external, potentially malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://philabc.ru/uplcv?utm_term=redmi+note+8+miui+12+global+stable PDF link annotation
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdab370b5c---91652462995.pdfIn PDF document text
    • http://dienhoabacninh.vn/webroot/img/files/ronojovotanadadowe.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/dojolesibanejodes.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/nogodiwop.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/27457293847.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/gogekofif.pdfIn PDF document text
    • http://krupongs.com/images/file/kosavereruva.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/lasadurazinasodovakif.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/14414188441.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/94029161283.pdfIn PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/91557338363.pdfIn PDF document text
    • https://msiutilities.net/documents/24818865054.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/96791579416.pdfIn PDF document text
    • http://ilkjv.com/Images/Media/files/dizajutopefuwevomutepog.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/wojugu.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/befuzufatef.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f696697e7d---34981090615.pdfIn PDF document text
    • http://www.slappedtogether.com/editoruploadfiles/file/57489028725.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/87467576275.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/wopudizabekadesitapu.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/69272022879.pdfIn PDF document text
    • https://servauto.fr/img/user/file/28559002120.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/pepetuxamebetov.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/b1g8sjqm1jqr2r9dagddpirgbg/75682418177.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_off0000d6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eeca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECA 11156 bytes
SHA-256: ede805da4fe4bfc011cd6f97e3b48d493e7c33631ed46642b4d3f4ee6fd15d0d
font_02_sfnt_off000108bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BF 17528 bytes
SHA-256: bf8042a606acf6b7c01126c72ff115e5dbceeadb1caaaf56ef7cda2cc571f862

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