Malicious PDF — malware analysis report

Static analysis result for SHA-256 345c6d241222f505…

MALICIOUS

PDF

92.1 KB Created: 2021-06-28 13:47:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b07fd72b165da6eae22596e3427507e4 SHA-1: 55df8fa50a68667b263b96cc8fcba6d547e76213 SHA-256: 345c6d241222f505ce54120ec2bb8688f0104d04484e1688c3650e8743141568
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating it's part of a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f3d6d07f8---36531988664.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/vtuhaqpbvp75qhddm8srvusnsl/48433580399.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d51364eb498---wovuxuse.pdf
    • https://mmszke.hu/files/file/22059168764.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608166c809ec0---55780082287.pdf
    • http://cortabellanews.com/userimages/vepurumasofikaxetofizude.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077773f8cd25---57742252388.pdf
    • http://sklepjola.pl/userfiles/file/56701225153.pdf
    • http://africa-emergence2019.com/userfiles/file/32871367028.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/48aef7707044b13c3309b033a56a1636/26696055412.pdf
    • http://dui-antidote.com/images/userfiles/file/piwoxukositu.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/9c12c215e407ac6e7ed9b249e5421c11/45048554102.pdf
    • https://widepolymers.com/userfiles/file/65936742090.pdf
    • http://from.ua/upload/articles/2021/06/18/files/44822253572.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/f58eb241545be75ba95cd3a3cc836718/xadud.pdf
    • http://myjobcareer.net/userfiles/file/2021061105065773499.pdf
    • http://kudusde.org/resimler/files/gekoxozitelitogamor.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/08bb0103d611c2547c6e9b0a2a952d08/50445330726.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160b794a55fe90---7563921148.pdf
    • http://creatinglifeoptions.com/userfiles/files/fubixabaxez.pdf
    • http://interel-rus.ru/test/sites/default/files/file/30117045141.pdf
    • http://kiavysocina.cz/UserFiles/File/48369468767.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070b32b2cb86---23746806084.pdf
    • http://ijdssymposium.eu/upload/tesaledojepebud.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=circulatory+system+for+kids
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102a9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x102A9 16792 bytes
font_01_sfnt_off00011ac0.bin
c870b1dfe130aa57205e36355309a9743b50f1eb44e2c1f422ffbc0cc584ce54
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC0 10872 bytes
font_02_sfnt_off000133fb.bin
0c1418e1a4fd5fe9fa877f53b5f3bff0fd7444eb8a57ab00bcc4891926464274
pdf-font-stream PDF embedded font (sfnt) at offset 0x133FB 17496 bytes