Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc0eaa120be83fdc…

MALICIOUS

PDF

93.0 KB Created: 2021-10-06 04:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 96d845ef1bbe0a20f83595551db9b207 SHA-1: 6f12c6f762f80c4aa6a3c55fb9deb03a8891d84b SHA-256: cc0eaa120be83fdc27c463c96ed856c453b5ee208e506bfbfccdc2fd8505c027
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://sushixusa.com/userfiles/files/rozezaj.pdf
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/temugepulugodirimuxa.pdf
    • https://sarvodayasamaj.uk/upload/files/buvukizumiwugoda.pdf
    • https://silatur.com/js/ckfinder/userfiles/files/gikijode.pdf
    • http://ahzgbh.news-read.com/upload/files/71746945711.pdf
    • http://safetruck.gr/images/file/wadidif.pdf
    • http://etspak.com/survey/userfiles/files/76844825908.pdf
    • http://bularz-auto.pl/images/userfiles/file/48354719098.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16152953c9e36a---xexaxosikodajebonewediwa.pdf
    • https://hse.tw/upload/file/fobegigejawodapaj.pdf
    • https://istanajpdua.com/contents/files/96552444315.pdf
    • https://mogilew.ru/userfiles/file/penaxejiwudovokadiliwose.pdf
    • https://worldmedglobal.com/userfiles/files/64067864633.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614cda3f94b0e---sefeziperipoguduvoluk.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614de1f48cc85---dumokexesusedumokakojuzo.pdf
    • http://dalaichau.com/files/4449848389.pdf
    • http://aow.infogestnet.it/ckfinder/userfiles/files/revivotivukufadefe.pdf
    • https://baxsporthorses.com/userfiles/file/97556119444.pdf
    • https://hanoihome.net/img_duhoc/files/jeletan.pdf
    • http://www.naturhalles.fr/fckeditor/userfiles/file/fejalopogevivevogokinina.pdf
    • http://saltokisport.com/uploads/files/vewixunepipilaxinogozarud.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=dr+peter+cook
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001052c.bin
ac05cae51477d6bab0d610bf151bb50c6002f45e76a9cd637c1f9df5d645b78c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1052C 9888 bytes
font_01_sfnt_off00011b11.bin
82034234ae1b5c7170155ec265e173e0055c1c239effc97852e70083bb23f7cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B11 20152 bytes
font_02_sfnt_off00014f41.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14F41 16792 bytes

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