Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e1f67678cb822d1…

MALICIOUS

PDF

88.4 KB Created: 2021-08-23 09:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 14ea35303e3e9b0fa73a58c543e36901 SHA-1: 6e04cb8e01cb69316561baae160d7fb252030edd SHA-256: 0e1f67678cb822d1a30459ac3dbd1bb340f4196d4778fed04778fca1c9b87059
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting an attempt to distribute phishing content or further malware. The presence of multiple PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://cpviettin.com/upload/files/nepukelakuwi.pdf In PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/9ddca0007852281fd5b45e58bb02a2b9/37346461250.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/95758456983.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/84681181048.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b486727bd62---9696577468.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/26304001419.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/95628149868.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/95653501324.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac70d669f42---vunowenisirinanepuse.pdfIn PDF document text
    • https://mar3ol.com/Files/files/pazikezomevuwur.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/refevotiwurodozasil.pdfIn PDF document text
    • http://getem.pl/files/file/birisizivugag.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/254d41c1cc51dde608f3872889293472/40994878477.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/tugabimowujomakakagumidi.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/43267074544.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/98804619860.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/1b45434ee0c4a91b340e66ad275a130a/77117133014.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/jemolavuta.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160876a22530b0---mivulewuzevubosorasivar.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721153627c0---29493459795.pdfIn PDF document text
    • http://mousike.it/img_ins/files/xodadevi.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/gurexavu.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/lisidizanikepobo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=ace+it+officer+professional+knowledge+book+pdf+free+downloadPDF 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_off0000f38a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA1 11096 bytes
SHA-256: 3fa3e940c84b232763ae310e6e465fb31f3361bf16fb0f75dd6711ab69296231
font_02_sfnt_off0001254a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254A 17156 bytes
SHA-256: 3160cb4f0a9d2c92b9c570863e166ea3061e4c975c8fa7f7658249e6358d7f4f

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