Malicious PDF — malware analysis report

Static analysis result for SHA-256 672a0ddccafa7b7f…

MALICIOUS

PDF

86.3 KB Created: 2021-09-05 13:33:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7ca8dfe3ba177df0d0aa2e71e9c35bdf SHA-1: 589b430f91466193855d84a0044cbc1d8a76e354 SHA-256: 672a0ddccafa7b7f939ac964b34b4ab420504f0571dfd0b933030d02716c0203
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://bruceautoservice.com/files/file/resuzuxewozoj.pdf In PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/m1498ho0hk686cpl54h7c8rbf1/towuselazowejigop.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/89716366691.pdfIn PDF document text
    • https://nevisnews.com/userfiles/piwamigaropaparajuragu.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa429da291a---62838376780.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/80132602264.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/97688837198.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/sirunafodobumegokefif.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/nibazorixowut.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/b0p068s6es3aa5hfb0qvbjop05/rabevesubokobusebin.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/7186463022.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/tafoz.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/ketakexifanokinerep.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e8cbdf98a29---49007839816.pdfIn PDF document text
    • http://www.polni.si/Images/files/58895332966.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/jd75k99qadac8a4rvjhokuv6ut/9686108230.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da31786239a---51282000343.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b03f449e72---sewajoleratusikifix.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/muwubemojobogezivo.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160884a48e1f48---situf.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210727_46BF5FDA5BBD1589.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160879cec23b6b---55326698344.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/p0858n41ic4ll2mpc4r011vr7t/44865874774.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/94242327032.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=benner+novice+to+expert+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_off0000ec7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7F 18084 bytes
SHA-256: 4e30196cc7d67b6d7b909dbf5244ab6595a2d3964bb1303108e6c69d0313756a
font_01_sfnt_off00011b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B80 10456 bytes
SHA-256: 50cc2e499c6fa7f668c00ea25af1f2ac4de802efaabff116fc722160e4797221
font_02_sfnt_off00013368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13368 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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