Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4893b4b16027db4…

MALICIOUS

PDF

78.1 KB Created: 2021-09-18 21:03:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c55e7c97573762156ea12d161b85de9f SHA-1: 171539073906eb9bcacddd2831fbca940a73a8a5 SHA-256: f4893b4b16027db4b6f52eec50d24a0a35d56819d5b12d49a65acf4e13015b1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://krisoc.ru/uplcv?utm_term=aurcus+online+apk PDF link annotation
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/64607163984.pdfIn PDF document text
    • https://yensaovinastar.com/media/files/vuvuxevefaj.pdfIn PDF document text
    • http://ranch.pl/files/file/lilabarasozewa.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140b2f52e857---komafegepa.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/15581877836.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/28536023660.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/giwudugufuma.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/pebunito.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131b32aedc7b---xinowukefatizaza.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/tegimasagafi.pdfIn PDF document text
    • http://melabo.com/upload/files/jilowagikotuzakuxo.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/lamojopogebonano.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/14547997924.pdfIn PDF document text
    • http://jianianhuayule.a9188.com/upload_files/art_files/files/20210903_053342.pdfIn PDF document text
    • http://dobermanncz.eu/files/85638951428.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/63512724025.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/lalesokafarabopebu.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/2237067824.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1613610f7bdb04---35562763536.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/cdb9e320c30882c5794424d96653a5fd/13396970470.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/kavixax.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210902_67A094FFD6CA91C3.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/lotomogovavabusafupu.pdfIn PDF document text
    • http://klgd.spokoino.ru/i/upload/files/jifukozenatepafota.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_off0000cc6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47C 18040 bytes
SHA-256: e4349e12edc08e7f40e2f96b9272cb26f98ae9a8c06eb195716dc75871f02b79
font_02_sfnt_off0001135a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135A 10440 bytes
SHA-256: 82931d462811cc3d58b9236a1c594366b121e06df6017cf41294995134f4a545

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