Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d60be8a84fefd40…

MALICIOUS

PDF

87.8 KB Created: 2021-07-06 00:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 94494bfc7cf8afdf55fbe004ca57f0f5 SHA-1: 4c9ff19da41270a6b9a75685915564947e0c22ac SHA-256: 4d60be8a84fefd40a4e1aeaed5621906e471468cb16a04416b1272c2d7e2f9f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting it is designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated content rather than user-readable text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://catamma.ru/uplcv?utm_term=how+can+i+recover+my+files+after+factory+reset PDF link annotation
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812de271c8b---xebavasibutewowoku.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/2b0ecf51491edaa261e524a6adf53228/61063815475.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/c91ns6gvq9r1ugotgggnfrkdr4/denukuporotemenavonig.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/sawowira.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/71057335255.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/v4st5i4cf2af6quhpcff981p37/22417246577.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/i9per0q9huipsk6uq8tb9psou7/95822063857.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/92074977865.pdfIn PDF document text
    • http://wonikqnc.com/upload/editor/file/1624516114.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/e26att3fuqka3nupcsr1s044d7/butoxubuzijuvuba.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/a2hcolh8i37tludhvrr80i1a5i/26338005617.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/fc46ece1ce9c2f1042f9608f37937b79/26036621271.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/78823093535.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/puvegujaw.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/94792543980.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6be751c7ca---88696659812.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/72284190544.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/09853440fb8c66c20c818c325f22ba92/70075825932.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160700062a3e3f---vixerefosuwonik.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/14423938136.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/9s5rul49veak3hlfo3mc0scbc9/kakeduj.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/81063167195.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/e656f0aadcb35bb2a27d705a1cdfd178/nabixowavukefakoximaz.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/30168585359.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_off0000f4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FC 16732 bytes
SHA-256: 679f028c142af30a42441f84edc2ab2cb3546835c7356e7d6531d8901e4a2854
font_01_sfnt_off000120b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B5 10756 bytes
SHA-256: 7f21971c2e2bd8b5ab545034d4f76dfbf61179a7895c3a710720ac206342ee65
font_02_sfnt_off0001397f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1397F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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