Malicious PDF — malware analysis report

Static analysis result for SHA-256 551776db7157a243…

MALICIOUS

PDF

217.0 KB Created: 2021-08-06 11:02:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dba11ae05d62e83e3c849b70dc940ce7 SHA-1: 45463d26cfff44d74899fecaed0a6a45092a3a06 SHA-256: 551776db7157a2439bbdb16fe4f923720fc04ea53ebddc7c1f851ae9ac80a997
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host and distribute malicious files. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8603

Heuristics 5

  • 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.
  • 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://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a413d03cc0a---56780055100.pdf In PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160752b4480e1f---77455012179.pdfIn PDF document text
    • https://luminex.pl/upload/file/19125306951.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/95679374859.pdfIn PDF document text
    • http://safires.cz/ckfinder/userfiles/files/40465831589.pdfIn PDF document text
    • https://trunglamdecor.com/uploads/userfiles/file/13159857314.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c89c64d3e5b---kenibuvivudititobekupuz.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/cqdcbmrbptilum9boie1ad501i/zodaxebidef.pdfIn PDF document text
    • http://thepducphat.com/upload/files/xuvape.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/dokidagagugopowibavoti.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/59533179220.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/divusomoterufo.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a99304b468e---16258559989.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/75860808578.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/gedodesam.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607317a61d7d2---vepofe.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/bimulutaresuno.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b56a87f14b---nidobuzezomibujeju.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076efc2595a5---zorubopidukemadi.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/1u6a7hpdrcdss1me1v05381qh2/mojigaguvabesepaniwatuzu.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/a8ab4e93a65d981072acea39333d5193/29022731853.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072623c8f988---xedekomodekawudapuj.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/0d111d9b8185dab0170d32465fd914e4/71973045620.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/96706533980.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/10764868795.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=livro+a+cura+bert+hellinger+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_off0002eded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EDED 20776 bytes
SHA-256: 6a41cf691aaf189764327c73a475f93583510fda78f99466b4e6c4e89bbb7cbb
font_01_sfnt_off00032117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32117 10996 bytes
SHA-256: 00b314b3c4828d5ed0d2a2b9b0d0fd03b9f8da6966ed4ed7d06b345908ac6cdb
font_02_sfnt_off00033a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33A28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1