Malicious PDF — malware analysis report

Static analysis result for SHA-256 12fcf7a066dfd7c0…

MALICIOUS

PDF

81.7 KB Created: 2021-09-22 09:57:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9af8118a4e8374361181ccecfe040505 SHA-1: 4dfab59be2d24d5f3c8715b8903b3c398e50a778 SHA-256: 12fcf7a066dfd7c04b19403eae5c40714764aac550e200eb19ce8c3041fc3e21
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to various websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the structure and URL patterns indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://j26clean.com/upload/files/37595662037.pdf In PDF document text
    • http://levakov132.ru/userfiles/file/gufetajeropipeb.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac4e72615e---5372123155.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/38678127154.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/ligufexufaxirafagif.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bb7a74be7---69038777983.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161304d7d60ae9---3029730218.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141cf10c4149---6207700911.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/kafijuxomenaludirulekadu.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/80958192560.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc3534419c---vodimolovasub.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/99424769135.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210913_42B30913812BA5B2.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/dc8987a3e6e73546a57b16b4ab571a6e/17236582806.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/83509429932.pdfIn PDF document text
    • http://easy-sleep24.de/shop/images/editorfiles/file/13438938938.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/ziwiwedemozifenajita.pdfIn PDF document text
    • https://clinicscrm.com/img/files/setazekarexojodap.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/wanujegizubojikukorir.pdfIn PDF document text
    • https://flomogroup.com/upload/files/20905201089.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef66828488---mosoti.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/22431306615.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/44509900961.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/kebulunu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=make+apps+bigger+on+androidPDF 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_off0000db4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4F 10648 bytes
SHA-256: 00902f6dcdc9d98330fa3d915a2d2e924342c8b9ae367b8c9dee3377d34c603d
font_01_sfnt_off0000f35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6E 17496 bytes
SHA-256: f3652132a56f2b29ba9bb47f297285028e478be3ff58c968aedd86e1f65d9c30

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