Malicious PDF — malware analysis report

Static analysis result for SHA-256 c60bcc8c3f53e4d2…

MALICIOUS

PDF

83.4 KB Created: 2021-06-29 16:42:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5fcaf43e709a5f3ba1892ac437f4eb64 SHA-1: ba737fd9260a057a911a0b2a29911cc788898e86 SHA-256: c60bcc8c3f53e4d24b54f1034e156dc0fa5f0406a4caf55ed9b38e099d49d35d
96 Risk Score

Malware Insights

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

The ML classifier strongly indicated maliciousness, supported by heuristics identifying this PDF as a link farm. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the final destination and distribute malicious content. The document body is unreadable binary data, offering no further clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c96d6b3ed7---muzakalafixibilonobonis.pdf In PDF document text
    • https://vandolderskb.com/images/usr/60365968255.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/31949787383.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/34q80g835l2vu9iuqsad8e3g51/50774048396.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/baburexa.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16080ace558bce---tuduwifukomagomi.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/4dbm49bke63a28pcso25mdph2f/pixuworofawesavisamuxa.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202106091943570857.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d2dab79d0---67065346701.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/0c4dd3041ecf604fdf095072892c9c59/dazovimumigesalad.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adad5aa1f13---71087435952.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/wapexanibawapojonuped.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/ma6enosc01o4h7hpftqqso0rv2/70908986841.pdfIn PDF document text
    • http://gibisch.org/files/files/gafojukumonajuneni.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/91272586554.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/ketejase.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9e5d1dd9c---zimuxujajolomukitota.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0cb0d2158---tezijule.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/000b148f043ff029c053a782e4a5f5c6/11661707773.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/3a8f5d613af5a39b9a254e3e98d867a8/87296582827.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5e7656cfd---54212905888.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/0520befd50368d722b35321c0002c7d2/wevavudumovaxirowogeg.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/96066683528.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/s0r1jhib42d4bs5pvkrsvctff4/4853232675.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/45130645424.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=4+pic+1+word+level+89+answerPDF 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_off0000e34c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34C 16780 bytes
SHA-256: 43a64700d97095413a07a2bc8ff246bb3eed6e6d11296400ac393f5bfcbd3cde
font_01_sfnt_off00010ece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECE 10968 bytes
SHA-256: 0eb811fdbb02d3334e08a06d6416c3ec4791aedc281ffbaf719fcb074635fa55
font_02_sfnt_off0001287d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1287D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1