Malicious PDF — malware analysis report

Static analysis result for SHA-256 33e66449677a113e…

MALICIOUS

PDF

85.8 KB Created: 2021-06-28 04:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: cede318ab7eddae5c17f83cdc752a534 SHA-1: 6135c9451a76e27cebaf8daba7af479956078e87 SHA-256: 33e66449677a113ebc94941eddfbf55a9871bd49e0e04b5db66b3764b033e8a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded URLs are indicative of a phishing campaign or a downloader for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ketchas.ru/uplcv?utm_term=muscles+that+make+up+the+rotator+cuff PDF link annotation
    • http://cs-golfclub.com/ckupload/files/sufazureru.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/81924131515.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/5a822551274b7b56b72e56ec79e5ddd0/42691807621.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607153f444ebd---sasovopaxok.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16088abb63264b---miroxoraxilosetuwet.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/56161989861.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/63891161155.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/petovubedepaxi.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b481b806d05---18493503569.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/7f66158edf2a18278a4f20e3efd3344c/bajapexuzedalarododaxe.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6beb40c9c---51798846649.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160c62fa7e6896---pezuvozuj.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/d10904861621cca3b6197ebf7d2e6efd/tanikoxufefuf.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb0e41a83f---kilerosiv.pdfIn PDF document text
    • https://marosme.ro/hirek/file/zagetudop.pdfIn PDF document text
    • http://alwaysfavorentertainment.com/clients/879371/File/89668466706.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16089ce411c45c---witusipema.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c34b2fe7cf8---46242141241.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/0fe2b3f3d1383437b7995bcd9764316e/83624146184.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/34637392713.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/2rr440kl6ki26fcaushrp7670v/gopazimururubaxobaparaze.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/3d73bbfcc25c8071f2f4b020ae688d28/70495814409.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/pl3tnoliv40ij4nchcrdv8eejr/57605766713.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/ln9505f1uu7u2hlqloj9qrlcau/82326967924.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_off0000ee7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7A 16420 bytes
SHA-256: 6043675b95bed37999eb9cce074c7aab94246522c38147c3b91a94d845ba0f72
font_01_sfnt_off000118f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F6 10732 bytes
SHA-256: c66d51a2566fa92237a43ff8b2870b254b42654e7b2f62cd88cf68bf1f3b9cf5
font_02_sfnt_off000131af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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