Malicious PDF — malware analysis report

Static analysis result for SHA-256 32030681fc5b9f12…

MALICIOUS

PDF

87.1 KB Created: 2021-09-01 05:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 78403fbdea3ef76e412e6a8600395bc5 SHA-1: 505bd2e8ab39b5582f923a16904b275294b2c3a0 SHA-256: 32030681fc5b9f12bdc9c34f796d92bd7fb0564663f78e07738d13d169478df5
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised CMS upload locations and disposable hosting domains, suggesting an attempt to redirect users to malicious content. The document body is unreadable, but the heuristics indicate a focus on hosting numerous external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://cablexconsulting.com/Upload/file/50394861022.pdf In PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/2f21b641281e49f508af48db00feec9b/15015658503.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/41520527079.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/gukeguguza.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/83e50lhodrthddo8lq2r7bkd6o/95523490827.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f85fd3c527---27750199119.pdfIn PDF document text
    • http://tara77.com/clients/46590/File/luxoxuvanatofol.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/82950591121.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/lujikafatavexamuwi.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/basuremopajiven.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/57a8d8c95e8a5bdd11582e78338f8e77/werexivuwolarale.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/h7t3ucvtco2nc44dunpljeghe5/rokasesinojofufiputamuj.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a6719be83---52796217942.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/20647278805.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/68496010101.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/15979870703.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/24049915987.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/vivilisetiwulojapimokifug.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/bogobor.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/puwazenekevipupujosutiked.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3747d4e3a8---sovomusitilofa.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210615052152.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=temperature+on+clingmans+domePDF 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_off0000eb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4C 19328 bytes
SHA-256: da7a549c2a2d207b9066589147f4bced5d1a67eea175f5918b54347ef4f21eb3
font_01_sfnt_off00011d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001355a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1355A 10920 bytes
SHA-256: 5ddaae2085a543a941f0ef2713fbb73978ece10c7ec87fb9fcc1f527181758c9

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