Malicious PDF — malware analysis report

Static analysis result for SHA-256 22370ce337dd4eed…

MALICIOUS

PDF

218.3 KB Created: 2021-07-02 11:33:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a3a085b304bb045bcda70ca3142efa74 SHA-1: 2766cbdc48cd40882666c3586a375ad25c4e6ba9 SHA-256: 22370ce337dd4eed71c7639cfd605a4138c3fdce0407a084e37dd1e47fbc1499
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall pattern points to a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9852

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://brakos.it/file/tulowig.pdf In PDF document text
    • http://101-games.ru/images/uploads/files/66420638923.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9ea42cf9d---mitigolulogiwovotodibiw.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/7927948521.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f08e88c7ed---48236238967.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/47867318238.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/4cc24385d46994175f3ba6426bbc40ef/gemikizozenolafu.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/radalow.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/89267288666.pdfIn PDF document text
    • https://medtek.vn/storage/file/bifobigafifowiseka.pdfIn PDF document text
    • https://menu2uplus.com/images/file/69040464791.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/8o1iefv3r6md01fjq90tq40as3/zizok.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16096603d6f9c6---patadudakonijet.pdfIn PDF document text
    • https://go2germany.ru/files/file/22468663392.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/a737b83bc9e33adac0ca7439d38e4fdb/93136479436.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16085b00921318---lirir.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092045106c07---92940556565.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/wemedow.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/48499863767.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/24350031674.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160796e33bd3a5---52481730655.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/vufovebiviteripojekapapes.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/dcd40be53ff3e72ac8ce9f61e30b8a44/99736115840.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16094281e0180f---45645911547.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=first+double+penetrationPDF 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_off0002ff1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FF1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0003172f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3172F 16932 bytes
SHA-256: 6199e834f1cf95fb013616863670df5acc551ec57bee6a44daeadbebb9fdae37
font_02_sfnt_off00034339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x34339 10604 bytes
SHA-256: 0e42617310f2b1df764788ba2553b6c15fd7c82415172a6bc76413513c3b1432