Malicious PDF — malware analysis report

Static analysis result for SHA-256 60f98208a2abcc87…

MALICIOUS

PDF

69.1 KB Created: 2021-09-12 08:33:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0ff5d3d81f4d7b90934c8b252003ff6f SHA-1: c8aea2bb5c9288d2785aed3d81759789625451c8 SHA-256: 60f98208a2abcc873511d95bb30587c02dc654b4861fb68c146ec04b2e147e3b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The PDF also functions as a link farm, pointing to numerous external URLs hosted on potentially compromised or disposable domains, suggesting an attempt to distribute malicious content or phish users. The presence of embedded JavaScript and the link farm structure strongly indicate an attack pattern involving user redirection and potential payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://aptekainternetowa.net/_mdm_apteki/file/derupuju.pdf In PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/b79b7447d9345dce2c79e56110046aff/98733309421.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/69436599376.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/maduwusapuxixi.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/24578811312.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/it4s037qgmvr8sr9gco391f7lt/20184721846.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/8535028144.pdfIn PDF document text
    • http://yibetter.com/data/files/40535248540.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/buxaposebalokejolokig.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/93762269401.pdfIn PDF document text
    • https://graphicart.ro/fckfiles/file/66183983213.pdfIn PDF document text
    • https://codefon.hu/js/ckfinder/userfiles/files/dosomumu.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161393f7574058---wijakiregawox.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/sifoxutakemaxofuwubogu.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16134f02a1923d---63743352505.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139d603dc06b---ribuga.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/njrrjm6i7s4qdafqmdc7tt7qs2/jimumusufisupilizega.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/35702670690.pdfIn PDF document text
    • https://casaalu.com/luutru/files/fakapoweluziwisatobi.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/59026401717.pdfIn PDF document text
    • http://hiniceshine.com/upload/fewetajadamezuzuvili.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109060703095776.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/46212941541.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/xavirerupo.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/17104473103.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=arc+launcher+pro+mod+apkPDF 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_off0000af99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7AB 15484 bytes
SHA-256: 0d1af4d3420fe947fd721aa60d3403d48f783a3ab534ccbdf2a50d6b4d06cc1a
font_02_sfnt_off0000ecf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF6 10596 bytes
SHA-256: c3713d8c52b98897948913c33d8ca6723075372f969aa918fd7a16a950e9483b

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