Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a2a7945f72f5657…

MALICIOUS

PDF

70.6 KB Created: 2021-09-26 16:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: be9d8bb31711914ef3da341d69c388fc SHA-1: c20334b26d51d8cdf30f22078fc0325e5b4a3977 SHA-256: 4a2a7945f72f56579b0b55292a8f47e04b6dc48fd1e8381fcd78a95bd70a05a9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is a phishing or malware distribution vehicle.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://inwebjor.ru/uplcv?utm_term=new+nds+emulator+for+android PDF link annotation
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/54307669033.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613134f582ef5---kimubowejowomelop.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/18263244889.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/kotawusigigujokidava.pdfIn PDF document text
    • http://topstec.com/d/files/neforidonujud.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/11121487477.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/80274168477.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422b40046cc---83996972608.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/7nhtio5ou339q3rfgc2bqc8a2i/fofapulabomizopagusi.pdfIn PDF document text
    • https://clap-bas.com/userfiles/file/59229499809.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614d43af8752d---nometefewo.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/gugakavewametid.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/mepogafiveguva.pdfIn PDF document text
    • http://www.og2c.com/images/file/xojuxusadez.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/16325851446.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137d3372d607---naponubekavuxarivuxomid.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/nikigatup.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/14498585274.pdfIn PDF document text
    • http://medicareclinichowrah.net/faboriginelist-braj/userfiles/file/sonosaf.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/nutosidedesodarasero.pdfIn PDF document text
    • http://na3.it/misc/file/sesuwafa.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210911124657.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/75583055604.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210919161201.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/lesewuxovatupozamiwanowa.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/votejuwinofu.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_off0000b54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB54D 10676 bytes
SHA-256: e2480bfda70f9162747d2ba5a65d9a89d67a6e295f0b665b89a2eb6b5c2e25dc
font_01_sfnt_off0000cdcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DF 15248 bytes
SHA-256: a8a6fb438b70436fe7cb7282b2d89b008b70fd6e6adb2f7ac79e2725fc704267

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