Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fc7f242ec8c1bd9…

MALICIOUS

PDF

87.9 KB Created: 2021-07-14 01:32:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e8510f3a3cad55a680ae2c2467c81114 SHA-1: c2ac045774582ae1666dd992821662f645e194a3 SHA-256: 1fc7f242ec8c1bd973fe27c432e5772e853abce9d7da04787963729dd3282284
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute traffic. ClamAV and ML classifiers strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL distribution are characteristic of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://easternhoteljeju.com/FileData/ckfinder/files/20210707_7B5E61B1853A1DBE.pdf In PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/67rbupubl2474jm8k3kekf2ing/dumagomo.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf47b093d17---36541303678.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/81jtver6esjqfuobe2sdqdqvvl/44396814019.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/78453373882.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/fc62b33629d2eab44b55023c89a40a38/jifaxenumudomafe.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/m88valfdjjieh01b6vulgh0933/zidugowola.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/72d9d7be7359f1c2079a14503ae0c0e8/bikur.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/35974993624.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-2/20210502112408633152.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/sixoposekakutofamela.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/22679397870.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/24810888112.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/23624954789.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/db9ms611q2m1bemust01a9dg0u/11872250469.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160d762260807b---mudaxukodutulowirinuf.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/winazonawimaxazudomabezu.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1608f851b74cb3---bifukerekapoleda.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160997f5f6e05c---95783291127.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8834cb671---pimikele.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b997649975f---mofomufurutovewezi.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db7c0b55322---11909676732.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/8uq0dpjorid2f3feom2ubbqgen/xunaxok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=numb+as+a+hakePDF 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_off0000f937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF937 10120 bytes
SHA-256: 007dd1e25bee1c6e451e190d1dddbbcb904a4e029e4603ecc490956c7df7d7ba
font_01_sfnt_off00010fdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127ED 16604 bytes
SHA-256: 251fea397060fc0b8fc24a6932d85a6718062d371d2305c52cfbd9dce78251c7

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