Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9a01137d58aba8b…

MALICIOUS

PDF

81.6 KB Created: 2021-09-07 01:17:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 07bf55793ff0e9ee1c037b89ef8ca230 SHA-1: a7664ca2fc2eaafb62452f863024f46511b93de1 SHA-256: b9a01137d58aba8bb1b3ec925de0051c8809144a16f74ac1d31e8243dee58575
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to distribute malicious content or conduct phishing. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 https://laborke.ru/uplcv?utm_term=toro+42+inch+zero+turn+mower+owner%27s+manual PDF link annotation
    • https://esprimagroup.com/userfiles/file/xumatamunovirol.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/1249839381.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/janufulapuperajesoza.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161323a3787152---6481377113.pdfIn PDF document text
    • https://dejavuruse.com/userfiles/file/96201884956.pdfIn PDF document text
    • http://come2menorca.com/images/file/gopoxapanufezunekox.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7da0331bc---81450988706.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/guronagak.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/99138447519.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b367043ff8c---55925295985.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8411c724a8---38215117645.pdfIn PDF document text
    • http://pvvc.cz/files/milepezakogiw.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/rotirevatamapo.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/xigul.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081abd494cb7---26227214675.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/vowotuzedijotobo.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2a2f8c68d---17112095422.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160d61c5005b49---39159514785.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/95359714769.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/rixunimozibir.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/bevewikas.pdfIn PDF document text
    • https://europartner2.pl/uploads/20719987124.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/f7c6969798ad77f0c7df76f7c97dad1d/xipamevedugu.pdfIn PDF document text
    • https://nevisnews.com/userfiles/88460369979.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/pl5t09gpu17ob5o8tes2l5mvv6/dusomikorebimo.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/43123079013.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/3b6db7685d8eae1eaba1c147e0f01d95/50843416898.pdfIn PDF document text
    • 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_off0000da3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3F 10936 bytes
SHA-256: 7982732ad275931a1e189c44ec1fec61396b2f9caad8d21a936ca69f740954cd
font_01_sfnt_off0000f3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB7 17044 bytes
SHA-256: 2ec6aa1d2bcc10d68351f874beed5d3e47d4030b65fa4033138f6a9513bce7bc

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