Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cc93ab3f081c213…

MALICIOUS

PDF

71.8 KB Created: 2021-09-05 13:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 45a126119e2a952113b8d868e045c9e2 SHA-1: 3b90cf5b43ee03664808ab22c6ef0d196cdbb056 SHA-256: 0cc93ab3f081c213f47c90c10fc9ca7c0277a0fb026215ce434f94fecaf46ccb
96 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier strongly indicated maliciousness. The presence of numerous links suggests a link farm designed to direct users to potentially malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://podlahypilat.cz/admin/file/24020161949.pdf In PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/91fc7f478d89a340da2aceda67f9061b/vupaxo.pdfIn PDF document text
    • https://edinburghpools.com/contents//files/mizezazag.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/nisulu.pdfIn PDF document text
    • https://casentinoshopping.it/file/73315232316.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/89555045659.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/32953641811.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607285f803830---zarasew.pdfIn PDF document text
    • http://esistore.be/userfiles/file/73798125927.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/16065436498.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/9878364306.pdfIn PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/dekejiwidefowi.pdfIn PDF document text
    • https://rajatotogroup1.com/contents//files/7650007394.pdfIn PDF document text
    • http://redactron.com/userfiles/file/wujogududufumufotikozat.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/78834442207.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/tevafudag.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a88eacacb56---27088740053.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/fefovivukixaro.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/watolukonulikabeliz.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1629939268.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/bugomimawutaraja.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b7808db2d63---fevigobesatemipatiruduso.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/f6490ef30e6ae1377e3e1d3e30a03d8e/lananuxowiwotexonazarek.pdfIn PDF document text
    • http://chromatographvials.com/d/files/giduzilagipojenebexe.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/vikodexosifurubemir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=necrotizing+ulcerative+gingivitis+pdfPDF 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_off0000b8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D0 15416 bytes
SHA-256: 52650ccf636403cddff4a37e40cc915e04e4b53dda2980baa0adf105ab139276
font_01_sfnt_off0000dfc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D8 11000 bytes
SHA-256: 17893e90b68ec778707d223047bee0336f9435149ed52465ce562a10574d52ff