Malicious PDF — malware analysis report

Static analysis result for SHA-256 24dbd13ff6d65d4e…

MALICIOUS

PDF

82.8 KB Created: 2021-07-02 07:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8db60dafae17a39eba44bb995174815c SHA-1: ec437a378a3a721c6fd7f048e0abb464d0df5a64 SHA-256: 24dbd13ff6d65d4e4c7959ef57edac72e7d6a0e34fa35fe17c6ccc1010318a5c
96 Risk Score

Malware Insights

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

This PDF document is identified as malicious by an ML classifier and contains numerous links to compromised websites. These sites are likely hosting malicious payloads or phishing content, indicating a probable spearphishing attachment attack vector. The document's structure as a link farm suggests an attempt to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://oniceh.ru/uplcv?utm_term=what+is+my+birth+year PDF link annotation
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/7ddce4a3cf515a79b709576e7b7d6f31/toxezuwowawezekem.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4853cad18---82461398972.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/taxasilosoxitubidipe.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/l0r1k0e80r2j2a18jgrpt6nvt5/23428037000.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2c80a7065---velerurabazokiruvugeviga.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a995eeb4dd7---zasepubupirev.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607058258ae69---66889169280.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/e0d236fb5e662cd87f4dce941a0a5b2d/77377731500.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/0d2a7bc6c62f608fb72ec5945a5bfb8f/nuxamifavirululinel.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834f82398be---97910305781.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3548dbe3c7---85871587210.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/zubabasamagi.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/21fdedd529f2c92f49c9ec171ad27da3/28412467769.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/buvasewakatuzudul.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/f549556f1b259568e80e3e70fd57d5a2/vedivegobek.pdfIn PDF document text
    • https://panificiopasticceriabattaglia.it/file/79789498362.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/e83s0lrksah0thmc137aq748k5/mowiwerenoxalezaxas.pdfIn PDF document text
    • https://go2germany.ru/files/file/14742044776.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/42331310760.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d191fbb93a---funakaliwa.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d02c5e9a7d---bapixedadiloxi.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0be5bcdc7---ropigaxigadesedo.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/38b1ac9c91e57a99e4384d263c8e5ba6/56333789605.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/novasaxumow.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_off0000e01a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01A 10348 bytes
SHA-256: d5923dae60d76461c7f60e0359235541a2bfacb1d5be0156294e6d2b2e05a5df
font_01_sfnt_off0000f786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF786 17696 bytes
SHA-256: 47fd6a8297790b8827a18e3982039e3aa5e08ae29610e9ca1561485cb2a24cc7
font_02_sfnt_off0001266f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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