Malicious PDF — malware analysis report

Static analysis result for SHA-256 987af77d3e4fd4cb…

MALICIOUS

PDF

275.1 KB Created: 2021-07-22 05:34:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bd11a40d87644fdd8f6d543f1e1c1056 SHA-1: c2a20ef43767dc7c82716ce9ca6f2c604448df65 SHA-256: 987af77d3e4fd4cba61a82b5aa5795ebf56303e68fe4e2a212ac75d6f759d5b1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm heuristic indicate a likely attempt to exploit users through a compromised CMS upload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8107

Heuristics 5

  • 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.
  • 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://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832aba9499e---12221971584.pdf In PDF document text
    • http://appartenvue.net/appart/upload/images/21665392393.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/v6im5b6d83m5pmmmo69re1fsk4/11848157027.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/oajnq4stmlnf6gtabgonnf54ii/purikexovomugoworurud.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/siweb.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2c07b65f7d---zufoxifopenutanazipal.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/0e43118f9d6090ec75160fad0ad118e6/japupuzirewejizefajal.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8292855dd---piwakikapupupu.pdfIn PDF document text
    • https://mszukam.pl/dat//file/25963505891.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/42736882604.pdfIn PDF document text
    • http://lowndes85.com/clients/d/d3/d39312ffd46aa2fbcc4e4de04d96a17f/File/19726493326.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/452b369cb6547c051b5d8d7b720f06a1/57902741426.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/a457dffb98cfce5e8dd63e3573c83eda/xugiwotarososisog.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/92797569897.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c1e6a56c4---21011620581.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/12782138173.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/suvuraru.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f79e23550c---17431757253.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/32618811814.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/xifalodanuguvopikab.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/k3plmdmdnk266c7insmes868nm/xabor.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1607efd47dd953---vegatinakipofavomelenazaw.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073aac8ed5d3---nezuxudubetuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=java+discussion+forum+source+codePDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00027816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27816 20664 bytes
SHA-256: bc2b60607fd07acb2255ee8af19e018c793c7a231221cff4d1efe1ee18773722
font_01_sfnt_off0002ae88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AE88 130264 bytes
SHA-256: 79f13e36e114330baa3a023150bf44ab5be68557cb220302a3031566217677e9
font_02_sfnt_off0003f6e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3F6E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00040efd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x40EFD 10652 bytes
SHA-256: b0341b5bd7478c280bd808c324991be045697d649b2ce17c03e9beb33b1b83a0
font_04_sfnt_off00042764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x42764 16084 bytes
SHA-256: 325c5f5cda05429ae92d15c23118ca1b8712e485108c584e1e30b0ff615913b7

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