Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9f3b803a0cce65e…

MALICIOUS

PDF

108.0 KB Created: 2021-07-22 15:31:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0fc47d677bbcb01d2959b1328f167ce9 SHA-1: 60b36ce15b82c570b2b5a06c8051556fc020281d SHA-256: e9f3b803a0cce65e3b2131185edb2e6c438e41db1c0d29134dc1be096ae3377c
196 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristic 'SE_BROWSER_INSTALL_LURE' suggests the document's content is designed to trick users into installing malicious browser extensions or updates. Several URLs pointing to compromised CMS upload directories were extracted, indicating a potential distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9828

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
  • 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 http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/60d8cc338249dd6dd1bfb5cf375295b9/vagosapizixusiginamumezu.pdf In PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a9427980b3e---bowonudegem.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/021c34370077c698c989feb631f175cc/93346000517.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160adab4744dd8---fupulejisumizapopudowigup.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/93191775313.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083cad62443a---19326153082.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/88719773941.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/n8j9u720mlk32s8c9febu4a6n6/zizefanaxateka.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/zalilazaxupulukemibobisuk.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a36956c2b3e---kaxizuvasoxiwefidixeri.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa131b5ea7b---nodafidozamimevojan.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/3027751519.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16097a3024e6cc---sezavebiwanutomezekiwip.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16082d9bdecb90---58854093745.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/fobadadogegarila.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/mawiwama.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/n739qdk3j179e78jr5cpt3jer7/jetafiwevuduzogezudozexa.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/zuvasubefele.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/d90dd856f2a7670299817d9eec94a60f/41439709130.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/05b47306091827a318ac2dbe8e73662c/zipojepabubimez.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160be33649f90c---24931141636.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/9k4nqujci0aaekoe0h3ji0en7f/dabavojok.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/83217839657.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/69281591217.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=precipice+meaning+in+marathiPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00013a92.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13A92 17248 bytes
SHA-256: f6fe6711355e966ec1f809421cefe09cf6215904304a0f61796658955f72231c
font_00_sfnt_off000115a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A0 3128 bytes
SHA-256: 50b5dcc11f9d10c99b2540bf2153201b3b17028711ff3781e736cc98f10e6ef3
font_01_sfnt_off00012281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12281 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15427 20644 bytes
SHA-256: 8696d1447d651b5c6cf1a771240e7d7faace59fbbc67723287a42788c1838205
font_04_sfnt_off000189a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189A2 10488 bytes
SHA-256: e745820b4a336bcef20a6bf75adb76c7920d3d13871d89d2ad6bfda58c4d7cf4

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