Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e3741339738eecc…

MALICIOUS

PDF

75.6 KB Created: 2021-07-28 08:05:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: aed72d2ea00c58956dc7fb53529fe2d1 SHA-1: 41bc641cc15b84b07896c5673c92c35fbbf26f2b SHA-256: 5e3741339738eecc4d1bde9ed7c255b983d97b402502039fb78c92180897691a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The embedded URLs suggest a phishing or malware distribution scheme, aiming to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160db6bab2ac26---25564850588.pdf In PDF document text
    • http://patroha.hu/file/46605313214.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/8e8293a3266ad0065c1ea16db7e77f40/muxelodin.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16081e720dfb8c---sonimivujigarewimupurevi.pdfIn PDF document text
    • http://bmhs71.com/clients/c/c9/c97ff408e01126d63256cf68004d6641/File/40096792919.pdfIn PDF document text
    • http://restorationteleconference.com/clients/73716/File/75382235929.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae024789886---luturerinabo.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/24941255217.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/buzowuwebagenixijoka.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705f870c58a---62352935152.pdfIn PDF document text
    • http://www.uniformsolutionsforyou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d84a5bb1ff---ruwajif.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/55801398351.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081cb28e3ce4---gunajusitapulenipavetin.pdfIn PDF document text
    • http://meechoktoolmart.com/user_img/files/26437248239.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecc96a9295---61668576184.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/43909815216.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/8061086082.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/6442805409.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/sukodovadojob.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/ek5qh19p2dgnfif0vkkmmmsfpp/mumotavopilugixagil.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/e51854045136f0eca078f1dabe85204e/dakutujadetivigufufaz.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xodogelafubuzetuxuxonok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=gun+mayhem+3+unblocked+games+for+peasantsPDF 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_off0000bd31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD543 18168 bytes
SHA-256: ddb0f8f3e93961121d01ca1f6660b20a7bef181bfe9236b3a4984aa6a7a71b91
font_02_sfnt_off00010396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10396 11632 bytes
SHA-256: 3af6c18118b076057cc243b9bae0919e88ec4cb3d85a9d61419817b3789153d3

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