Malicious PDF — malware analysis report

Static analysis result for SHA-256 26362879fb1a7fb0…

MALICIOUS

PDF

96.3 KB Created: 2021-07-02 10:13:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: eff2342040955835d28b79eceaba800d SHA-1: 7cc3a85d05255587b084326c4d699925e38b1b44 SHA-256: 26362879fb1a7fb030be3952bea2b50107fc945b8ccc58b035d1c6f520d6d975
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. ClamAV and ML classifiers strongly indicate malicious intent, specifically phishing or trojan delivery. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b6309fd0797---21446812335.pdf In PDF document text
    • http://maciejabramowicz.pl/upload/files/file/fapijisojutekit.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097dd8daf26f---jesudotifegufegorosipuka.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/lcqoo9ip2mdt5alukebn89r8eq/mejetak.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae074b16a77---nivolufudipebeg.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/36399251245.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210608/file/16231478153910.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/55036470261.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ff403f29f---lagafivifolujawa.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/72791427212.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/jadaxusiseve.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160983a2e3b0da---68629433481.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16093b87b7e74b---kigonopix.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1e8c3ed28---raguxatuwaranaxof.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/unfucgo52m0pee78jmo0frnia4/22007975299.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/dopetanazoselisere.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/d46a425e9e2f3a99d0007030ce8a9db6/70797618345.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c95982186---pedurev.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/b855319136206a2bd343b24af7f7d71d/19894688982.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070936773201---53522232798.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/kojijoselev.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/d49f5683ba5f682efd6d922f2c655deb/3875121971.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=hyperglycemia+and+dehydrationPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11005 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12817 19644 bytes
SHA-256: 41f84085d3746adb928d69f9f1cd6ce0c50b43507b36a862e2a6a08effb86c73
font_02_sfnt_off00015b3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B3A 10900 bytes
SHA-256: 8c06aee336a7edf27bd4fd66fa86740080894bea23e4e7f978aac3da21d5bded

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