Malicious PDF — malware analysis report

Static analysis result for SHA-256 6279694e1688efcb…

MALICIOUS

PDF

108.3 KB Created: 2021-09-04 09:12:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3f9de50cb15e2915890e1bba7ceb2d8d SHA-1: 8b948247990068170be67da5b8acc91b3568a7d6 SHA-256: 6279694e1688efcbd48e618fd91ec161c0e20f37b8ea7a01ae12baa12e32c7bc
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple compromised WordPress sites, likely intended to redirect users to malicious content. The ML classifier strongly indicated maliciousness, and the structure suggests a phishing or redirection attempt. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 5

  • 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 http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16121a2102e450---nixexitegukuluxowu.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608058a915d4d---60889457161.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16130dbb03dbc2---21718283662.pdfIn PDF document text
    • http://takeacode.eu/user/d41d8cd98f00b204e9800998ecf8427e/file/xuxijekutipefazakiwepad.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e9e3bf2cf---megaliweta.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/98320207032.pdfIn PDF document text
    • http://konberdbio.com/upload/files/68784523767.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1822a4e672---rezagitenogijamatekovase.pdfIn PDF document text
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/koronubuduxoriwolones.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/789b986c8a4a708b875e59fe47673094/janutofononafako.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/15583592711.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071b1606ff9d---pizadipalomap.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/49297105623.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/77503146178.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4b200377d---1015525560.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/86701953255.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/43413874121.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/nalezoz.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/e53852672211e5cece3593c1841b7456/86637698071.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/77c7c1492a394a870562c5a4f38ba6a7/4246584081.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/tarabebamoladevubotuf.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862a9282459---kijarorunazosu.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62aba3af59---rekobimaforuxebuzo.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0834c594b---toxofuzukuvirupofo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=public+administration+books+for+upsc+pdfPDF link annotation
    • 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_off00013853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13853 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15065 21980 bytes
SHA-256: 26ab68a397825d52cd3a66185eaecebd5d156e12da0ec90ba2b9d2e075a36853
font_02_sfnt_off00018a52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A52 10980 bytes
SHA-256: 3ca29c1546d30d1a303f726dba7bc276330bc9d85bd3935bf7872cdc7d72333f

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