Malicious PDF — malware analysis report

Static analysis result for SHA-256 e227a399c0e99d2d…

MALICIOUS

PDF

78.4 KB Created: 2021-08-23 11:34:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 45dd9f3529cb5a99e1c5e54edf590b08 SHA-1: ec84b6c2af92999ad9bbc66e2afc328cefa8cc4a SHA-256: e227a399c0e99d2d7491a34dfc4b18095d6cef9713aee41563f1c51e1c576756
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ML classifiers and ClamAV, specifically flagged as 'Pdf.Phishing.Trojan'. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm or SEO poisoning tactic. While no executable scripts were extracted, the presence of numerous external links and the 'Phishing.Trojan' classification indicate a malicious intent to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://asianmosaicnyc.com/userfiles/file/padodiwimiwomawoxuxav.pdf In PDF document text
    • http://allg-gyn.ch/userfiles/file/48978373702.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/34466614395.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/wufixolojaded.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/89036296011.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-15/20210515190846989396.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/d83fe90816ea1c8c6e9b966958d7c499/20423974196.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/2183753955.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/rimuv.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7572b6f1f---pirifukekevubaxasar.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/qcpu94gvlnel3sui4amfl6q8pe/92858610613.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/uu6kp6ms08fluv0arshmica53f/palebesipujivujekasikuke.pdfIn PDF document text
    • http://abwessex.com/uploads/files/majej.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/89321305031.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c98b30b9dc5---13833628273.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/4b64c5a7cf155957d30a7ce02d9bba3c/legonoso.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/31212499895.pdfIn PDF document text
    • https://edarky.net/data/file/jozixanabu.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/miwitelex.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/46857767655.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb6b0c6464---goxawizinozopixasukewetif.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078eddf57592---sesagavobajiraxatisamegos.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/fozefa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=a+court+of+mist+and+fury+in+orderPDF 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_off0000ccdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCDC 17756 bytes
SHA-256: 4c8fc6db9d0e54f6efb023f98828d8e4dd43178a8c0919d49de675ea722e6134
font_01_sfnt_off0000fab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB1 10784 bytes
SHA-256: 24fbb6860a375d696e5459616bebdc6067824577f789e88451ba639f03010f8f
font_02_sfnt_off000113a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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