Malicious PDF — malware analysis report

Static analysis result for SHA-256 c56ffe64c435ba5c…

MALICIOUS

PDF

80.7 KB Created: 2021-09-17 06:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2b0541077c9ce0c60936f8f1875ecdd7 SHA-1: b4a09d8cbe124f1d7006d517f3de41d8f6958b6e SHA-256: c56ffe64c435ba5c9541f9379acbee085f999c2b05d13385efc0938951677ed5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. The sample also includes numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://realfootball.gr/userfiles/file/doludikixurofaziwidofe.pdf In PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/33b9a9f74768573fe2a9c2c98785049e/lebiwowidatuvuvuzowamiwu.pdfIn PDF document text
    • http://topmebli.com/content/xuploadimages/file/davevijobutaluzidalogor.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/1495335170.pdfIn PDF document text
    • https://southafricapools.com/contents/files/saperejawobumuvekitafa.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/34490758911.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dusajedevovalimipajodobe.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/90729432946.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210903012250225375.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/78407663099.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/40828244599.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/4bf1cb8d43ee90ae9e202ff14e82f5b1/86306469196.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/52911399232.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/rejofodo.pdfIn PDF document text
    • https://ms02bet.net/contents/files/jogimamopug.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/058b4922d8bd24ca88ea7ed2dac6b52c/96090217253.pdfIn PDF document text
    • http://premo.at/userfiles/file/10785907773.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/lufopugijagibilurafeku.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/35092164481.pdfIn PDF document text
    • http://baove247.org/upload/files/wefut.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210907171701901055oc0jzu.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/bosik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=jogo+de+nave+espacial+para+androidPDF 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_off0000d1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AA 10648 bytes
SHA-256: 3ac66eeb4747d5f4ea83912570233eade5562a4b5691aaced9eecdf953d8c09c
font_01_sfnt_off0000ea02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10214 20508 bytes
SHA-256: c235242e62b0a136fcd2c82d56e2ee9f80a01b7e5fac6306e78d0bbcd4af20ac

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