Malicious PDF — malware analysis report

Static analysis result for SHA-256 d871811d4c13ea4b…

MALICIOUS

PDF

78.6 KB Created: 2021-09-07 12:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: a8f8a2543fc0aac195f7bbe72185de63 SHA-1: e90a0b9af18543ce804cc005957477ed4d2b0b7d SHA-256: d871811d4c13ea4b5c8d1c40da9e6514ad24c43820f6df1ccf6928009376ae54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The presence of ClamAV detection and ML classifier flagging further supports its malicious nature. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://queure.ru/uplcv?utm_term=economics+class+11+sandeep+garg+pdf PDF link annotation
    • http://dzbnf.com/upload/file///nofekopusigizedabuf.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/40705f6d642a3fde60dbff168994f0b5/giduzixut.pdfIn PDF document text
    • http://shadesvalleymounties1969.com/clients/868959/File/jefefiwojobelukixikez.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/ec7341a2c7b05a81e8964496c9e48702/87139085311.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b43548a352a---10442875281.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/15sbr1hv6pkp6ns1orqkrlmjd0/komitalizada.pdfIn PDF document text
    • http://ud2-140.com/files/sofowazizigob.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d0f0d90bc2---bowixitavutijefutox.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/6843456ad785efa5eeda6b6506ead700/79876145820.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612409102ce19---natuvodexuwixofufosos.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5c5ccbcae---bazozopipeza.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/94620693651.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/neguzoxazigarojalebusi.pdfIn PDF document text
    • http://dogable.de/userfiles/file/rarinebiwajekojerutad.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/nokeku.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/5eaabea159669371a5da62b1e401b081/jivasusopufanekadevora.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210820194551_8bmzxk.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113721db0857---sidibokexovatoj.pdfIn PDF document text
    • https://osakadentalcare.com/contents//files/21123563904.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119d6379d1f4---xazivedotem.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/40960494999.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/69795603983.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/nitejuzunis.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/93251269517.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/edt27nk4mtn033b849v5mb5o7r/94307243884.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/ravumugagi.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070b744bd71e---febubitetarutaxesebu.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_off0000ceec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEEC 17312 bytes
SHA-256: 9002e38bd2a428302f9c9d4233158fcefa4a25746bea528be9f653cb58cfd3c4
font_01_sfnt_off0000fb90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB90 10900 bytes
SHA-256: e77a314e043bf3fde7ada2c6a1e1d7010fa21bb77ee77a2e0b62f45f3f875db6
font_02_sfnt_off00011487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11487 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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