Malicious PDF — malware analysis report

Static analysis result for SHA-256 3117df4c7d371f4f…

MALICIOUS

PDF

91.9 KB Created: 2021-06-25 19:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9a420a29ee3daf1c9058be2b5b02ce6b SHA-1: 1612c5c2112c74c3ea8751485090b9654306d46d SHA-256: 3117df4c7d371f4fe76b0c72cc6eb9af8fdb8637f67bfe0f44fd517a0a449259
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to websites that appear to be compromised WordPress installations, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the link farm structure is a common tactic for redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a45ec073c8---fegulokubexonov.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a725952e0c---62503055546.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/cfe444a072179b97524abe37bd9db128/5776956641.pdf
    • https://aulacvn.com/upload/fck/file/wavululatawuviresixire.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081906a6b2d5---809654719.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070deda7b1b8---jodedigefabarogenexir.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072771b25831---18154879925.pdf
    • http://autodilykanka.cz/cmsimple/images/file/vupapisibomaxebejego.pdf
    • http://dichvuwebsites.com/media/ftp/file/zaxakazexokogiriva.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/tv3vq7j57punbauge31bgt1m6s/81022030667.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe0260f76---gopokivudat.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/0012d068e16723dad6527742ec8c7525/60821931652.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/bc15fa351c2cb905efcda49b7ae84d58/lopimogobipibalomi.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607a19d412398---gazipolutulagexur.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824a4936912---81651903324.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a88d76b060b---47746526177.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090aae3dfd99---mixigatiwakidir.pdf
    • https://aprilboya.com/userfiles/file/lixisurumebokomugajatuk.pdf
    • http://bpsstudio.hu/uploads/vojaxonu.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b12dc20f466---80495691872.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c538463c6---61097992988.pdf
    • http://rhodeislandalpha.com/clients/56223/File/vovafanosudojusekow.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/dgrg7e2vfpqs1ai4gfrrsb1r47/bezodifitulired.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=basic+manicure+cost
    • 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_off000106e2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106E2 16792 bytes
font_01_sfnt_off00011ef9.bin
9ee691d9365cdfde7939101cda63f62ada5aa26858163e1d8f017c08b989e8fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF9 10500 bytes
font_02_sfnt_off000136e1.bin
c874a9a8d1b24d2a4a23f8491cdb94c391857fed6ce47cb1a4a9f6db08130f26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136E1 16980 bytes

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