Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3403537816fa6a7…

MALICIOUS

PDF

79.8 KB Created: 2021-07-04 02:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f3a8afc1f66c1038229b18dec07a63b1 SHA-1: c3e5ff2a08e8bef46fc7a4465b34f68be54aceb1 SHA-256: d3403537816fa6a7b49d6da2f4a1f233c636b0b36574c94429ac6cd0a6f8ff20
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 it functions as a link farm, with many URLs pointing to compromised CMS upload directories. While no scripts were directly extracted, the nature of the PDF and its embedded links suggest it is designed to lure users to external sites, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/de97ee5d93e2d6c67b048444d297ea1b/81095500563.pdf In PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/bebutazeganinanoxonef.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/jebosizutojixuwu.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/f2269b8o6j7g6d6pq4fsc9cd1q/82438969166.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/33600205907.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/defom.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/78278190812.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/zurewikimixexazoko.pdfIn PDF document text
    • http://hillandcunnreunion.com/clients/864369/File/61097752006.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c9210e872db---34817797981.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/71889756299.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca50f7f745---widot.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/50831137765.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160dbe1d48cb9d---xiwotiz.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/53b6f873ef9f55851472228eaad6722e/3762861388.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160727a38d1737---nipukazatosebokur.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/e9ecd005fc202a9ffdb48c84a83f32ec/bagelunobawib.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/1263517890.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/jhmjrkr5v62hedcj8kcm92hkn3/86764574427.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606caf7299875---11608284322.pdfIn PDF document text
    • http://veivel.com/userfiles/file/99666484470.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/vofikiwilimipe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=150+sgd+to+inrPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/4c111a2750c9a43c3547770e1c928ee0/faralaz.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_off0000d6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC4 10292 bytes
SHA-256: cd7f27e89eea32a39a18c441a2c14a9d61938dbfe064966534d6663ce4ac8e98
font_02_sfnt_off000105d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D2 17156 bytes
SHA-256: 9ca68817c2c4eac2c764b04cdc8f6b1f3c6f26dde91ab91448bf41d55ce02a77

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