Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddf5ca67dddfe6f5…

MALICIOUS

PDF

75.0 KB Created: 2021-10-05 09:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e4c39654ddab45b69b9b2d1cf1567046 SHA-1: 1073003944c5e48322301a6d10772a1d97bd105d SHA-256: ddf5ca67dddfe6f50c11ebc8966fce603ef68ea1df85083e03433b21aa1aabe9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pistant.ru/uplcv?utm_term=pdf+stories+for+grade+4 PDF link annotation
    • https://sgicorp.com/userfiles/files/5685620733.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/segebefodex.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/44022026666.pdfIn PDF document text
    • https://digireg.dk/upload/8105238637.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161515d1853fd5---39196417642.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20211005112544.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/54369252183.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/42742903881.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/gunokiduxukifofotobi.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfd515f150---18742834581.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/powen.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16159c62082ff7---12535847803.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/guvotelamowexobatinutaki.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/30661959445.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/voxanutapotikezusi.pdfIn PDF document text
    • http://gazomotor.com/allinone/file/fuwowodenuzised.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/tukoxotare.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/18714235997.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/42908632654.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/gijomegewod.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/wowipasezaj.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16156b15d2de9b---kuxaxaxevavaxel.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/kaber.pdfIn PDF document text
    • http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/39700242529.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_off0000bde0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDE0 10460 bytes
SHA-256: 0eba6c673edb040df342524272f0df36ce092659b3f64ffbc3dc7c08602d6736
font_01_sfnt_off0000d59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAC 18532 bytes
SHA-256: aec51e4b8d9ca7790309a5d044091a98acf26ed42e2bbaeab236d2c744976e7a

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