Malicious PDF — malware analysis report

Static analysis result for SHA-256 ace4ec85a628fa45…

MALICIOUS

PDF

94.3 KB Created: 2021-07-21 13:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 71ee6ef94eb92cc26629faceed3c0347 SHA-1: 96c07dfcfe9e7b6da5030ad22469d6cf8595c64e SHA-256: ace4ec85a628fa45d3eaa7f024255d3431dacf25406ea521919c3f56385c8dae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. The file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the presence of multiple external links indicates a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

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 http://taikenplan.jp/ckfinder/userfiles/files/53311811624.pdf In PDF document text
    • http://edu-family72.ru/content/images/uploads/file/rimuvotujo.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/57921807523.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a05f59d00---wividodoma.pdfIn PDF document text
    • http://myxroad.com/upload/userfiles/file///28176647610.pdfIn PDF document text
    • https://daiichigroup.net/uploads/news_file/4553226062.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/6668d6180f32b19664fa68f58ea00953/35704986478.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/zolibapekowaj.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/75988558005.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/cpb9vop8116adl2tbk42gtv45e/lebumagef.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/93791686835.pdfIn PDF document text
    • http://csss77.com/clients/d/df/df7f2fdc42e243c7a03c192a8228c0be/File/ginid.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/549155ae54285a4a3f26b9f1403ae7f4/17844305903.pdfIn PDF document text
    • http://lws-realestate.com/userfiles/files/mupavozuxujutezuliga.pdfIn PDF document text
    • https://mahae.hu/files/files/82425913936.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ab89caf3f33---69191281875.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/84f08b686431b6829bb85a85411f1dda/zevaburisuxudat.pdfIn PDF document text
    • https://webmenuplus.com/images/file/21398563816.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/69653941518.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/f74fa67512b38f7ed16a7469cc70639b/fopelupol.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/25ae8d211d0ea7e5cff97f594ad71f7b/wolinawodasokoxiwapak.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/purexak.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/85657238579.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=retail+stores+that+hire+at+16PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF464 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7B 10368 bytes
SHA-256: 75bbc7782aff3ec72b3fc470867ee3b01f9f02be01eb62d68058a6aa9679bca1
font_02_sfnt_off0001241c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241C 17500 bytes
SHA-256: 90aa303d608fc7c55347fd13e77776c85ee08bc9fb4d9ceac0e96e3af8ef9a0e
font_03_sfnt_off00013e55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E55 17284 bytes
SHA-256: a1c73fccd595ad82fe57c6e018c952ec931c7d02460c1741fdc415fa37eedc46

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