Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e809366318816b3…

MALICIOUS

PDF

91.2 KB Created: 2021-06-30 23:15:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 34cac8146a6eafc5aef990f98ce57f14 SHA-1: e2e1c2fbf2d7058c4f9a920cd31513685463d6e6 SHA-256: 1e809366318816b3fb1919eb07876fab45d98f764bb5622a5d965abbdd0dd7b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://krisoc.ru/uplcv?utm_term=annotated+bibliography+apa+7th+edition PDF link annotation
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/n6ud6du9qd7l9farvn1781v1dc/17348619856.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210528210904.pdfIn PDF document text
    • http://davidlbrooks.com/clients/868292/File/42400820304.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160892c448aa24---kerixowafuviwikoxosajiji.pdfIn PDF document text
    • https://wita.lt/images/files/95215626697.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/28d51d634908002fbeab0f0973218628/62894307243.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a65d7fe9e97---ragusigeko.pdfIn PDF document text
    • http://qhs1978.com/clients/d/dd/dd8db5a278a7ad55a2ada34b8e38ebcc/File/67139242491.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/dexamumukomitapebojosagid.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160a487e2cdf83---53871718506.pdfIn PDF document text
    • https://norservis.info/files/files/62891632982.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160893e704d15f---22897717352.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/34931132379.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/difoj.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/bibufori.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/7f12046b31e7338e312c0dbc31c99c98/bumosakotivakukob.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3cc1fb1e40---56532691507.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/idfqjf5ih7a0jfsbecglt3k36g/52327576696.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6f5491e3a---83656319312.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/7761050329.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/kobegunejiba.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/dakaxaluviveguxokozev.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c859cbe8f6---lowuberovewotazin.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083644401ee3---rebewevividosav.pdfIn PDF document text
    • http://physiotherapy-warwickshire.com/user_file/file/ripifusekafodoponurewaju.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_off00010289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10289 16956 bytes
SHA-256: 2e8903f89c9ef3b3a24d4d367f7ec291b865d39ebd5ef8b9bcf7fabd54c53d6a
font_01_sfnt_off00012edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EDC 10788 bytes
SHA-256: ae6bb58ce6e4b6061d7f7912ba8b47ee31d0aae2b9bcf176a5c57e5670b23f38
font_02_sfnt_off00014744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14744 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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