Malicious PDF — malware analysis report

Static analysis result for SHA-256 8711d6cd8164a459…

MALICIOUS

PDF

78.0 KB Created: 2021-09-02 11:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5729fdab21c69b5ed31a1801667faddb SHA-1: 78d44f6d00b1f95a4237fa8a43bc4cf4b0aea292 SHA-256: 8711d6cd8164a45981a8ffaf6a0e6e867add3fbea65531e1a3ef9b4db81a9f40
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external URIs pointing to compromised or disposable domains, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links. The document body is unreadable binary data, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 https://laborke.ru/uplcv?utm_term=moral+development+definition+pdf PDF link annotation
    • http://hncastlecable.com/d/files/fowaniximofefe.pdfIn PDF document text
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/xemudukadejexapewili.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16072f11a17038---kuxuwufirunegafine.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cb7c36824d2---kejukotusofa.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7b0f6afbb---79726569871.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/4504611613.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/mmdqqcviiu9hjdr714mhmhl3tg/82936671226.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bc34a692610---57918064850.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/8087158182.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/faman.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/63860241928.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/2hbicnqhof7at3587ue90lepq1/56483181144.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/84960358893.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/81415640363.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/bewisosonikejexirajekewe.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/xitowutunekepazazajepu.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086ff55651d7---94369282278.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/bifokilipogupewaniralol.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/95265280764.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd0447f0f62---51203076596.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/65749360282.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/famirawonetifibuzajib.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name//files/wulowenafarewut.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/tatagika.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/wovavajiguriduguwesodigig.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_off0000cac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DA 18340 bytes
SHA-256: ca381efc44db4de47bdf8f5a29021fe70dac92c0caedf894d392a3bc05b82cc0
font_02_sfnt_off0001124b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124B 10552 bytes
SHA-256: e51be3130dac9ba311a6f3082786b2d4d8b1c4bc6da06862ea875422611ccf48