Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d56b9698afd6bec…

MALICIOUS

PDF

75.1 KB Created: 2021-09-21 20:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3fdb3ef34fab97b4da46711d03f70df8 SHA-1: 57dd99277d3234dd17f17c68b0bc9f69527f1305 SHA-256: 2d56b9698afd6bec3e9a1be93bf4f1bbcd279a201e9f07872abd54fe0632a0e1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://queure.ru/uplcv?utm_term=anger+0f+stick+5+mod+apk PDF link annotation
    • http://mtkshop.com/images/uploads/file/33430090233.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/ruvetafunevebefesej.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/11848380531.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/gumafojukopila.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/sixaxemadajixerixa.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/39762007205.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/80670370029.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/beronuwobitelo.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/93038520447.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/97245888140.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/nozusifigo.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd60834d5f---13291539836.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/wigim.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/ec83cbb51a61a327a77eefc7cb33d83a/78509691433.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161491411cc1d4---89087716375.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/jugize.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/98511023886.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/xugivobukonosu.pdfIn PDF document text
    • https://priscar.com/documents/files/99897949344.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/57214903017.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/161434e0cdfa5e---tutenasanevumujeguvosaw.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/40048222976.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/zowefoxosudusifizovop.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_off0000bc82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD499 11248 bytes
SHA-256: bfe7f287c115ce82856823c4bb38ff0bad6c0ad8d8d15e775b62c1731072498d
font_02_sfnt_off0000eed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED6 17852 bytes
SHA-256: 6778152841a17ce84ca3af99992f733f48df107de7d5b97b25727ccb0362f602

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