Malicious PDF — malware analysis report

Static analysis result for SHA-256 de1492e7e7ef0508…

MALICIOUS

PDF

88.7 KB Created: 2021-08-07 12:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 92b916ca5e8d4c533ff33ebfe773b848 SHA-1: 4b84b78d51b6d354e7d3a9254203880d287e1333 SHA-256: de1492e7e7ef05083e4d63424c8a2c5a634902034249936e478f1ea750ab3a8b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that form a link farm, with many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the nature of the URLs and the 'link farm' heuristic suggest the document is designed to lure users to potentially malicious sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://catamma.ru/uplcv?utm_term=how+to+get+mystery+gift+pokemon+sword PDF link annotation
    • http://ideas4mypool.com/userfiles/file/26075858248.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/tobatukiref.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/pgvvdmmt37ej0oc0ppppdhhunk/rumojebitikerim.pdfIn PDF document text
    • https://t2sc.me/userfiles/nozilatenudawujesixowakob.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a374500cea8---43902879976.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16093d25030aa6---nabetabog.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/77231651571.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8f43cf06a---pobanulemejogowe.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d43cb7523---68608282294.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/kabefaguwapi.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/rofujazop.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/sevexedokegizi.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/2687109405.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/88412232503.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/hmurujivjoj50eh58gsgb5rvh6/kisenonefimupa.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/dotitopizi.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160894486065d0---lijenaxojatolizag.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd4ef37a61---domite.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b917a6c73---73607430582.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/nadak.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/noras.pdfIn PDF document text
    • https://jagamimpi.com/contents//files/86076643724.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_off0000f4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FC 17764 bytes
SHA-256: d8baf1795bd66cf8e8bdc824f5a657b067314899ec1665af00ef3e9792622414
font_01_sfnt_off000123c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C3 10916 bytes
SHA-256: 774f006434f8e9ec6d941f3b6abb29db663ed097fb52b584b02755657cd85689
font_02_sfnt_off00013cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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