Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbb2c695fffaf815…

MALICIOUS

PDF

82.0 KB Created: 2021-09-08 02:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5f5b4ef83569474be754f61fe45a404b SHA-1: 588aae95bd26008fcf1e54ab20a6fd8ddc5a6be7 SHA-256: cbb2c695fffaf815c54c353bf93acd4ab483d92821154a1bb3c753a3803443b5
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=excel+2013+vlookup+tutorial+pdf PDF link annotation
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/866a4bc6521f72e95c9dac379bc28007/dojewuwefopenedagigusexe.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9408a26329---palibunawuvomosejavimumuf.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/22957493395.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/75118711919.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/46050343749.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7f52e63a7---62261597232.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dbfd2f3036a---kazeligodijazusuz.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/84966155777.pdfIn PDF document text
    • http://teifsepahan.com/files/file/kurumumikasigefija.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/10089996794.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/raxusavozejotabo.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/karefirop.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210713_F3CB9C3212E13837.pdfIn PDF document text
    • http://capri.lt/userfiles/files/subudosuler.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/a53f6bcf16d0dd56a82369cda69f2886/66017173479.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/sprp7mn56obksgd4lre03j5ahk/76191432191.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160960cf54cbdd---12569007610.pdfIn PDF document text
    • https://zenithservicos.com/userfiles/files/pijiribuxazamonebex.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9fdd7c194---43645130827.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/038dd966a70416bb155affae55d85deb/timasibubub.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0627bcb65---28526517505.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/7558920760.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/98231064443.pdfIn PDF document text
    • http://www.hmh.sk/files/articles/file/38282328790.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/3676751218.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/41907192581.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9658543ff7---59920434740.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_off0000dc4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF465 11152 bytes
SHA-256: 87b2b47658fc5c2dcdacd59930c5e4e88fec682cd9d2b8fdb905ff12a797f435
font_02_sfnt_off00010eb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB9 16620 bytes
SHA-256: 272af847a04da1f4fe346728b4c7187d1ef137e0d265209ab179dfea8a802386

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