Malicious PDF — malware analysis report

Static analysis result for SHA-256 3205a57f955fa236…

MALICIOUS

PDF

86.2 KB Created: 2021-06-30 09:21:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: f3adf6e98b6c480c51c74b93f7e23222 SHA-1: 37b9df417e2db8aee0ae2d66e9457fce3f786a63 SHA-256: 3205a57f955fa23684b13717eb51cbaec94b596969009aab3b3a536c8d6c48e6
236 Risk Score

Malware Insights

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

This PDF document exhibits multiple indicators of malicious intent, including a high-confidence ML classification and ClamAV detection as a phishing trojan. The document employs a social engineering lure, instructing the user to install a browser extension or update, a common tactic for credential theft or malware delivery. Numerous URLs pointing to compromised CMS uploads and disposable hosting were extracted, suggesting a distribution network for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://krisoc.ru/uplcv?utm_term=speed+test+mobile PDF link annotation
    • http://www.rotudavid.com/ckfinder/userfiles/files/74733960177.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/aba2ec9f09bfc6497f4f4779d3100a2c/50371527506.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/deguguzaxopup.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/ngj4li76qe1rvemcfn8hd688s1/7162333039.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/movaxek.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/834d5baede7f73437a3d2089f036d3e1/suvurafirebopobo.pdfIn PDF document text
    • https://masihpt1.com/contents//files/24365568050.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/t7i08uotb7kgdc56vj0e0hufg3/bokubodo.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/navokujijexofikiva.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210530030427473606824.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/h0tieueogjq3l18gfeg1jrg2e2/liwoza.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/33400335683.pdfIn PDF document text
    • http://geraldkleinlaw.com/ckfinder/userfiles/files/24655823631.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e16eb6389---44112494132.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfa5438399---julerujojidonoxiw.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/14n53mj5rg9qks9ujk7pnanpj6/44216297124.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/956ef28162b9faba998fb956c95b1fa6/62490540662.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/e42725c4bd7cff6e9c87340c8fb66c31/97107869189.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b72a52f0329---35567532952.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/9osqt3q2debjrq91k361830k4i/vupaw.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/27400393165.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a42723eab78---pajasurudawutanipalitinu.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a60a582bf9---64128897029.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/24bd62e6ca6685115a1cbb0f5c8e8f97/39215104894.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_off0000f0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DD 10400 bytes
SHA-256: bf3e1e786371be53775da0f6e038aea6213792c386dfa1562d791515a6e4b289
font_01_sfnt_off00010820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10820 16852 bytes
SHA-256: 0bc16a9b49b11eefa0f37edbba98fbc210c9b361c99039a8e2b587369e212f36
font_02_sfnt_off000133b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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