Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f4dcad3abe64386…

MALICIOUS

PDF

95.2 KB Created: 2021-09-04 23:44:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 774f412d04aec7e3127660ef400fad8b SHA-1: 8093ce6b985ac907f70ae3af15047ca98e7c3bc7 SHA-256: 9f4dcad3abe64386bd1f3d361d039c5b1b8eb84a96f5eed3c2933051cc13dbbe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host or redirect to malicious payloads. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or downloader lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abbb8bd933c---nezefinevemunet.pdf In PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608015c88804e---24906836384.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/167441434.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/73859023818.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-06-27/images/files/85423083144.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e62e8e01782---7408871154.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/3056f45c04910ef9ae5658e70e159481/jisimemunixinuzuwupavi.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c05ec19e648---89588320265.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/mkpllue3ragcm486j57hunfu16/xivetijavodatalema.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/50add9c1093065772e81410642bdf7e9/sufekoxeziramew.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/e962e7d1f04826770768005cdebf314d/libadamotuwamuwuwaka.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3d255eb3c---parowadelunurunejevezonu.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0a1b96dcc---9114729410.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/rajagizufumewadatuten.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/tebadadinavasakabotufofu.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/fidifulevawaforejuxi.pdfIn PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/kaziwu.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/15528197207.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/pamubogugeta.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2afb399230---74039813452.pdfIn PDF document text
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/sd4rkr4hga40mau5p4l3sah9c0/90992583001.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a4411ed50---jimemagakebiva.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/ce79cf52d35febc6c3adfcc26ad3ff3c/20717807972.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a03e428f5b---48021905928.pdfIn PDF document text
    • http://transsnabstroy.com/userfiles/file/61310142112.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=farberware+3.2+digital+air+fryer+manualPDF 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_off0001049e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049E 22088 bytes
SHA-256: bd85217e665678fc16ea7a1e08b0a2bdad01b0024cf9c5bdf62e9b899f39b070
font_01_sfnt_off00013ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000154b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154B8 11184 bytes
SHA-256: 5a723b28d68c641f071a34b031c6834381f6f9060a371b3747c71c74fd52f541

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