Malicious PDF — malware analysis report

Static analysis result for SHA-256 9225889b56a878a0…

MALICIOUS

PDF

82.8 KB Created: 2021-09-14 11:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3bdfd8a9e4a6ed795be5c62df43765dc SHA-1: 5fb8b91d9cdbe9cdea099639f5c806c1a485e1ef SHA-256: 9225889b56a878a09194764f666df2cd43ada6ab5109f1184db0a7aa5538ea67
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised CMS uploads and disposable hosting. The embedded JavaScript likely facilitates the execution of malicious code or redirection to phishing sites. The numerous URLs suggest an attempt to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://krisoc.ru/uplcv?utm_term=play+store+add+app PDF link annotation
    • http://assessmentinsight.com/ckfinder/userfiles/files/74767330698.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/35675641420.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/dakowixifisoxelapata.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/90770667950.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/34125036359.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/44340460026.pdfIn PDF document text
    • http://suamanhinhlcd.net/userfiles/file/bugojarozete.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/78083201406.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/98143622210.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/34661392529.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/42794324486.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210908_152250.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/585f6c87e491d2d46b13105c87b0a61d/83196948202.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/99c058cb1d0023dde3354e4e6bca4eff/tarawidebojolelubotomuzuz.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16140031037dda---50038842273.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/95462706199.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/pisavujam.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/dafisupudeloxerubifusipo.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/42302018197.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/wawonagidexoliduvin.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/fenisamosogifirevop.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/kakekepegojomedabunugo.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/firetasoje.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_off0000e03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03C 10304 bytes
SHA-256: 0e1d7a8e643721e12cdf9258b8664faa36f0cdc8099b45f7ce89456858f68b54
font_01_sfnt_off0000f7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC3 17772 bytes
SHA-256: 5c504acac3678169d7e85d79a58a127c86e96de237a788dce78b29a0966b89f3

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