Malicious PDF — malware analysis report

Static analysis result for SHA-256 37603df78f78f123…

MALICIOUS

PDF

85.4 KB Created: 2021-09-08 10:30:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 660062911d9f81629c6c8b1f0f48c52f SHA-1: 1c8794eacd3261621082de4fcb61161a0df3a9ad SHA-256: 37603df78f78f123529dbe1837ea356eb12108ed19b1d67aafd9b1166ff1e8b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the PDF functions as a link farm, with many URLs pointing to compromised CMS upload storage, suggesting it's designed to host and distribute further malicious content. No scripts were extracted, but the presence of numerous external links implies an intent to redirect users to malicious sites.

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://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/96c3a4436af3b099eec81340d50098ab/10363348066.pdf In PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/cl65na7ue42c90l949gkejag66/wugowijewuz.pdfIn PDF document text
    • https://sce.tw/uploads/files/60b51edc0c8d9.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b64abf791c5---93676602086.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/tqbfiv0s96tuu89dm5gk296021/58137328868.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a354fca5d62---rilodumi.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/kutojatonabipu.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/3022155795.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a340d61f5---bupijekorov.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/mafexizidalevafafilasefo.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/lotul.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99627042288.pdfIn PDF document text
    • http://blueyee.com/upload/file/15134325897.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/23442b62b2b0bd0a0b9e755e8356ba14/suxebemewolurunukeviza.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/qh7kl0ii7lgtc7oqkacq4pb7dp/firesewabikubawavoje.pdfIn PDF document text
    • http://tdfinalists.ca/clients/43449/File/bumurejefagunowoges.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/zegogujewulaxadapodumod.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e3afc0f4f---balasotux.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f57e234df6---83581631975.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad94e889ba0---wupixugo.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/63df1765352dad00cd7e25add6799d39/tiveremanoxoduleduvotaf.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/vumadizegalatawepowuv.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/e20e09e6d39610276743b77d820a6ea8/kadafekomunol.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/7a85c6a82a049763bc069808212cfbaf/jijirida.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/94188646219.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=master+pdf+editor+crack+free+downloadPDF 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_off0000e6cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CC 18256 bytes
SHA-256: b23356c08baa84763241e8e84aba1c02f2e1b728cb3cdbf87e280d3514d8a9a7
font_01_sfnt_off0001165d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165D 10784 bytes
SHA-256: 1cbc1fe62407d29c3086b61a418546976b5813020cbca830e105950194181961
font_02_sfnt_off00012f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1