Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d7da1e6485c6e60…

MALICIOUS

PDF

85.5 KB Created: 2021-07-01 00:10:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5e94b145cac3254460a3ee0e0e56e712 SHA-1: 920825768b885fb2b6003fe11ca40aaccc83ab35 SHA-256: 1d7da1e6485c6e60c3bb4db40735119f6544bc20afc6d65d41259b0948196bc1
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the extensive use of external links implies an attempt to lead the user to a secondary malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://irlanc.ru/uplcv?utm_term=excellence+in+business+communication+10th+edition+pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/8b9fc8d6c5d1b6a1f122adda11dde5be/11573236308.pdf
    • http://arci-mp.fr/admin/File/21616662251.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/i113uhhll9bolnltia8rrr1aqi/87226573240.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/823cf36933807b5be06064e48952c77e/dunobetagilalejaw.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/o0qh5jbk1iku3tcomco9u67rl1/24542439952.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/0185eaf0445980b78966e159868630a9/99569239661.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b380acd8890---gitabekokudegomazowi.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160ae84aee8124---17130077617.pdf
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/72352701724.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d05bf38316---dikezikulox.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdcfb04fb9---juboxojalixogate.pdf
    • https://lescourailleurs.com/upload/editor/file/43708894101.pdf
    • http://ca1970.com/clients/10044/File/toguzusigaxefotul.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d1fb3a01a---danepovox.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bf01f7d44f9---pitazokukogipotekuve.pdf
    • http://classicalgardenornaments.com/uplds/file/wusedimagojobidevowibuj.pdf
    • https://condominiovillage.com/userfiles/file/36837637090.pdf
    • http://101-games.ru/images/uploads/files/66420638923.pdf
    • http://alphasigmaoverseas.com/userfiles/file/xavurumakutol.pdf
    • http://bumsnab.ru/uploads/files/moputikapidi.pdf
    • http://sumbulefendiegitimvakfi.com/resimler/files/lutigo.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16089a47f1341d---nomideve.pdf
    • http://stark-tools.ru/images/uploaded/25097328972.pdf
    • 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_off0000ebf0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF0 16792 bytes
font_01_sfnt_off00010402.bin
cced3bec7d85b20396bd3828553f701a3d8d210d4541a28289793d432b4a0359
pdf-font-stream PDF embedded font (sfnt) at offset 0x10402 16376 bytes
font_02_sfnt_off00012e43.bin
70679e5de73bcda27037471ed02f8bad0fb3830e8d1e6d9dcf9ba007402b6524
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E43 11284 bytes