Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ee9241035722949…

MALICIOUS

PDF

74.5 KB Created: 2021-08-29 00:01:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f5da72ef46c693d28ff955389d2d949b SHA-1: 22748867e9e1ab44c76ec07e6078939c92c89411 SHA-256: 8ee9241035722949cca70a5a00c201c3012aec75ef2e828ddcd7399339ef4709
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for delivering malicious content. The file also exhibits characteristics of a link farm, pointing to numerous compromised WordPress upload directories and disposable hosting sites. These factors, combined with ML and ClamAV detections, strongly indicate a malicious intent, likely to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://all-vehicle.net/js/upload/files/91915631311.pdf In PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/15ead5a2b4c82f24d42a92d8e228f7a0/53481999595.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16080acee0f7a4---83683543640.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb17fbd065f---refipo.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/foguxigeru.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/50287645851.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/32067172828.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/62e7461decf5d2062eb7e1aa25ebb339/92779136312.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/bq7r4b2e1odealbusd0pf5hfl7/56869517384.pdfIn PDF document text
    • http://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/demunejotowabatopurokadu.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df876c3b4d7---fudivexumagudilati.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/bufixuponozudusiwug.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/40847855495.pdfIn PDF document text
    • http://barnesfamilyre-union.com/clients/52050/File/tufafona.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/81477409394.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/4ef12bd6da4074871cdca018bd1ef95e/16082867400.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/kogeji.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4e4c27968---39966690045.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/89635595602.pdfIn PDF document text
    • http://thienanglass.vn/upload/files/jivak.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210618_CA99287F6637147E.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607785848f267---33108881630.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=training+and+development+questionnaire+for+mba+project+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_off0000c1cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1CD 15328 bytes
SHA-256: d59e02cc9b5640cab63595f4fd06366a3c01552ec4a6be701289504b095a693f
font_01_sfnt_off0000e86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10084 11508 bytes
SHA-256: dd0f78a6c378048dcd4fdf81b2f1c8808ddcfac6e4d04f7a606b64220244b75d

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