Malicious PDF — malware analysis report

Static analysis result for SHA-256 b53a534a0168fa8a…

MALICIOUS

PDF

81.1 KB Created: 2021-09-03 13:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e7c5d7896e239f740e412101489c146e SHA-1: 922c0117c211f47149f93c414dd40525714b0723 SHA-256: b53a534a0168fa8abf2fcf749f99cf7fc26ff55f5b41494d6e4a5f8476b76d51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://hungbuloon.com/media/ftp/file/49905371480.pdf In PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab15ff731b2---sazixugu.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/34147274337.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/c5qnrbub8ki551kpd40cjrl881/vufileluporogoz.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/wokuvulefaledofakakavodew.pdfIn PDF document text
    • http://meta-min.com/files/18410006991.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/noletemizifikurakajoxel.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/66824589822.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/oe21rv8vj3ki2mvjnonssjgdg5/sejud.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/bovakufifodamolajetabo.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/zixepudewuvomamaxotoxode.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611ff13fb69e7---3728461853.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/04bd86a1020252bfd562ad3493afbd64/reridukogimatow.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608023d3a0272---subuzotoj.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/45c8334a606649838612a7f842f5601d/64751174811.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607441adeacaa---kerusujupiwufodanukudivo.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/8ie26cg4irghlra1mckh113d07/waxerajibitirusekuguxoma.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/79101830359.pdfIn PDF document text
    • http://arslanemlak.com/E/file/ribelopime.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/8f3cbafc75c261b0db87ccb8d8465449/71221781532.pdfIn PDF document text
    • http://inistor.com/ufiles/files/rezidizuneledapoz.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/midid.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/c53fd7cbb743cf027ea6bac6e12bd19a/gamizetegogevisaxemi.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/68afc0d8ddc408bd754b563d8b0cf1da/xugiwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=property+renovation+business+plan+pdfPDF 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_off0000d7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A5 18040 bytes
SHA-256: 5afd4899f67fd4cc912e420df34f71ca89e028a40e474ad487edc9169c08be68
font_01_sfnt_off000105b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B9 10912 bytes
SHA-256: 93a971a0eda50405d1c4293e3249e3fdcfc45ff6297fb230c47e798b245deb3a
font_02_sfnt_off00011ee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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