Malicious PDF — malware analysis report

Static analysis result for SHA-256 5af7ed2a6c2144b6…

MALICIOUS

PDF

86.0 KB Created: 2021-09-01 09:37:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b1bb933fe255b863979798392b52c550 SHA-1: d19107d18e86329c5f03596b5b715c706acbe914 SHA-256: 5af7ed2a6c2144b6c16b169803b787d64665e889986b53ff974387b6082e6e04
176 Risk Score

Malware Insights

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

The PDF employs a cloud document lure, impersonating services like SharePoint or Google Drive to trick users into accessing a malicious file. Numerous URLs are present, many hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving exploitation or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://basisnomor.com/contents//files/73256550758.pdf In PDF document text
    • https://grandplaza.bg/uploads/assets/file/91683693592.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/tozotufofavuvuloxixos.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c942b02068---xurigemozadozosiwowipe.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a730b1f0a---buxudevofupusujurekerifo.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/95115755286.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cccdabceb89---12022861895.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/9b979eee153813f3719a73f0e7b9a50a/xujumoramaboromozetosava.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/1f6e0e3ed006424d9714930f6cbc56db/20273986057.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/4678388304.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/usbsmosgbh4k03huc9t4loe15r/78925464503.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e36533236cf---kegogosorivetefijaneve.pdfIn PDF document text
    • http://aawyx.com/sites/default/imageuser/file/76850427569.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/69577173238.pdfIn PDF document text
    • https://sayurhijau.com/contents//files/27641952540.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076b399ddce7---96484860925.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/lefedojerosulenesuwekab.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160986e7071483---19112142664.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/7n10a7e0pmt4b005003dgpjrh6/manugedu.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160987f59ec174---suruwisiwaxunabepidu.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/17374704791.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/tkgrjk5d4bfodbfnsg3ldrd832/gafutejuvavulisozus.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/fab7229cfa283304b881d66a9ebf366a/zukesobita.pdfIn PDF document text
    • http://cjatkinson.com/userimages/mutisiniramu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=convert+pdf+to+word+software+free+download+filehippoPDF 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_off0000ed28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001053f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053F 10780 bytes
SHA-256: 7bed671d8b5b318679dfb37b285234f3c09b8226209276d59b160185dce7f612
font_02_sfnt_off00011e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E15 16756 bytes
SHA-256: d767a85e7920aa723e894c506745c16ac3044f3127ddd256cc55e91fda705a14

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