Malicious PDF — malware analysis report

Static analysis result for SHA-256 656b8ce11beb47cd…

MALICIOUS

PDF

69.7 KB Created: 2021-09-01 06:31:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2d25a295089b4ebeff031548a316d394 SHA-1: 9bcf2e47ef65394278a378d9db4d36545a37d9d2 SHA-256: 656b8ce11beb47cde9246e26748071d0151ad2674bf397d22ac5cba677a0335d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload directories. These links likely serve as landing pages for phishing attempts or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9c9d9d168---35991110695.pdf In PDF document text
    • https://beldapin.com/calisma2/files/uploads/33447996437.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/xiwadudowufulivaxuzazi.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/4265a07d8ec687f0444a39f309dc1085/wetagavubulusapo.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/21766e730b8800aba386f71d658b8950/pefufutomaravali.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d23df07b47---45393274772.pdfIn PDF document text
    • http://atek-ent.com/upload/file/gusiselub.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/21034667511.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/gdmo3dqhued6e3gq1vt0ddu8s3/40890735731.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/t35dqeu0nkekrdq37t488ksnpk/89510309271.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add50d85cb7---vurulebokapeb.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/53423719609.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/47a52c61d766399bed6d93e8817620a2/golulijevudigemezuju.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/0kduc34uvubftisco8mgrejnot/88113264017.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/loxosaregufimomusapapeza.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jigutilesabepoxolatuve.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a14d27615d0---76860207219.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/df7e73993dbb51a98c72421c81c77fbe/2216690962.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/2021514543587882.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/17088709319.pdfIn PDF document text
    • https://go2germany.ru/files/file/94736580268.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=brave+woman+in+spanishPDF 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_off0000b32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB32D 10576 bytes
SHA-256: 0ed334fce857f76790451d03013980abba33856b285bf935f373f4ce5d9cf1e9
font_01_sfnt_off0000cb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB2A 15480 bytes
SHA-256: a50e57825b529a79dee085b4247311dcf57eb5d2964a6bb85a4ad0d54709d0fb
font_02_sfnt_off0000f224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF224 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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