Malicious PDF — malware analysis report

Static analysis result for SHA-256 f560749c920c16f4…

MALICIOUS

PDF

76.2 KB Created: 2021-09-13 06:46:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b657b4e8fa05655852ee052ac7193e94 SHA-1: ef4ae1ed9b7cade4e1db9cd629be4767456bdf25 SHA-256: f560749c920c16f4137cddbc186ec262ce39b8f1656a344b1eb3e76629d527dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://bokaichenyu.com/upload/files/redam.pdf In PDF document text
    • http://onishi-kyosendo.jp/archive/23335502402.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202109020508473256.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021911813373906.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/12755821716.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/pozusomojagak.pdfIn PDF document text
    • http://sciattella.net/images/file/39506366012.pdfIn PDF document text
    • http://taxfreepoint.com/file/wetejoxedaziwemase.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/96201055005.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/xodesewuxujejekuxoxo.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/piduzutekusi.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/39525914104.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/36085191268.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/jazetazigurunojuv.pdfIn PDF document text
    • http://medrea.ru/upload/files/19459938707.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/xuvazoxisip.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/88255466907.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/ec2ne6kt3ongu3jpuds8d62u0v/dogizepolun.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/92934226041.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/19171242416.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613b55a5acae1---lugufitivivemafedirolaluz.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/sikekumodu.pdfIn PDF document text
    • http://lg-palette.com/upload/files/78931411349.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/laxunefozekaxonalilaz.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/4498819364.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135974cc0564---laxedimik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=what+is+my+pattern+passwordPDF 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_off0000c318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC318 18268 bytes
SHA-256: 339e7c1b8cccdb13b7690836975dfe23547eab1d89692c442dcfe6f67943a854
font_01_sfnt_off0000f21c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21C 10804 bytes
SHA-256: 1d2c114b3cc6023d23bf49ad1ceeb24dfcf53efcd5a648569df72fe81fd614ed
font_02_sfnt_off00010aea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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