Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f789dd89c69394a…

MALICIOUS

PDF

80.2 KB Created: 2021-09-04 09:54:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5a2d957442895d029d14f4eb89f11155 SHA-1: 0e8500adc6d9b5327468b075adf8721a90b9bf30 SHA-256: 8f789dd89c69394af0e8cdf5ca8f9bedc921792d908e20c2e2aa348e82e7ee46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with a high risk score. It contains numerous URLs, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. One URL, in particular, is hosted on a compromised WordPress site and masquerades as a Cisco server configuration PDF, indicating a targeted lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16077feea7c6f3---47462608544.pdf In PDF document text
    • https://stvorki.ru/files/file/bukisiji.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/44003348613.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8e0266a0d---20059956501.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/4ff2348d51fe2ee14bf8c51eb9591124/33485998853.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/50115873773.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/53f79d1398bbdd33b801a9759c13c8d2/kefejalofabobewopef.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/61149009518.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608268d9ea8bd---bunigalepuriwuwumo.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/9929493071.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/99bae06eb9f5e5f2686a30568db31285/vofizolez.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bba76bae203---vanulafopab.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/29691858167.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f0bb61ffd---vonamafobaxirepezepa.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e6e7243b3e---gukepejije.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/40248691239.pdfIn PDF document text
    • http://ctm.it/userfiles/file/suxubupop.pdfIn PDF document text
    • https://qualitymattressfactory.com/admin/userfiles/file/ziloruma.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/direzo.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f2933cafd---zogajegidobib.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/33295653896.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d3184463a---pulebed.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/9790531362.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=cisco+server+configuration+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_off0000d6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C4 16916 bytes
SHA-256: f9d9b16f6bc3b3737bc08aa304afa5828ede855c55e1bae4ff276a49266d8566
font_01_sfnt_off0001024c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A63 10948 bytes
SHA-256: 7ed497f5838f0fa7539688bc9a6813eb1d42e345fdfb8fc4db80a4fdcc2ee257

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