Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4e1fc93268e2384…

MALICIOUS

PDF

83.1 KB Created: 2021-09-03 14:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c3e11e3ec789df152eebe35bb454969b SHA-1: 9eeb05ffead2c1f30f69a5e1c78e124b8589b2e8 SHA-256: d4e1fc93268e23840dd98a4608038c70a2ccf242b9095fd4dea538157f8cd29d
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories, suggesting a tactic to distribute malicious files. The presence of a link farm on disposable hosting further supports a malicious intent to obscure the true origin and destination of the payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c519308d16---jijabedipavike.pdf In PDF document text
    • https://sabagdasarov.ru/upload/file/82500791702.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a20ee51b307---53546775942.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610e40823f308---68491828974.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b4663eadcc0---88967312924.pdfIn PDF document text
    • http://srutimusic.org/userfiles/file/97806068834.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e051229d3---tevewawizugaromab.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/e8ae5f4dd21b37114b40d233d6b7a1f0/detaga.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/vawuko.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35755864883.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/lulojebunisaxekikun.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages//files/89114914530.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/pongvi2kll3bqm1s15lftle8bl/refukexupitekumana.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/fulekobuviwasifegu.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/sidavobiwezup.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/76887907923.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/70002141619.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/xipesivel.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/lidajowijuludirup.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a85623845---46197885149.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/kupemoxitosunazizifuk.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/boselejabonubo.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/e2697157d22315cd05a753968f664895/bugemotan.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/1vv7lbci6jufoh3lq0onqu0ku4/68529670771.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210805102258.pdfIn PDF document text
    • https://hissekurban.com/resimler/files/35171297810.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=sampieri+4ta+edicion+pdf+descargar+gratisPDF 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_off0000dc09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC09 19136 bytes
SHA-256: 31bcd452c06d887249c301bb6e84a18707240c48ef1a7dd2bce3c231a8df85dd
font_01_sfnt_off00010cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C9 11072 bytes
SHA-256: 805f06e5019e829dfab205aeae95436963ba81d1b970bcbeb75c21f1da318a85

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