Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a2e5ba7438d3aed…

MALICIOUS

PDF

83.6 KB Created: 2021-08-17 05:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 776c3679f65ff28d6fb181ad667bdf5c SHA-1: 89be3b8ebe4a7488fa094f94a7595dc99a2df66d SHA-256: 8a2e5ba7438d3aed868bd6889e3a5da2deaae67eb18ac719167502c418299629
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for malicious documents. The PDF also contains a large number of external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=bibb+county+correctional+facility+inmate+search PDF link annotation
    • https://buka.ru/sadm_files/27775932963.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210619042900.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/n0ucrmljso8tr96b5fbn92d712/56682445586.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/gamorovepuvaw.pdfIn PDF document text
    • http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/rowevigowowe.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986fb973a60---wokujobigufuvanoze.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bef1eac618e---gelijuwixolefupovexiz.pdfIn PDF document text
    • http://stratford1980.com/clients/1/19/19838be1bbe5684469623718d5e25b5d/File/83441372749.pdfIn PDF document text
    • http://sxcec.org/userfiles/file/gawosabibujo.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/ridedilunul.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/10165540146.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/9su7m5sli924ufi2s3hd90kjh4/89221697982.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160de0dfdd43b9---15794821325.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/japeza.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/j6tnt1fjqim2e3saqc0pb7gp6i/bowesalu.pdfIn PDF document text
    • http://klinok-saintp.ru/files/85959722431.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/nimaradidapemi.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744b2ce8485---61843467186.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a53af1f340b---74524304796.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/wabebedodubukizapekopote.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea1c1a9a2f---kukivurexoparaz.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/xiwasitegila.pdfIn PDF document text
    • http://rcvizovice.cz/ckfinder/userfiles/files/moxinedexas.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/wovofokawuma.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_off0000e172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE172 11008 bytes
SHA-256: 87915e287bdc0b4602dc321cabf3b577582a30f6c4a4e2aca889028fbcf74388
font_01_sfnt_off0000faf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF0 17260 bytes
SHA-256: c23fd2fda1aec848854486016f1c1f1875f874cc61c75631e083b026f58f1642
font_02_sfnt_off00012820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12820 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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