Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f4b13f86479e99a…

MALICIOUS

PDF

81.8 KB Created: 2021-09-13 02:31:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9bca141f6d8f10912ddecec3073e9900 SHA-1: dc0bbe9ad3b8423ea1517c2779b14249a09ec982 SHA-256: 1f4b13f86479e99a2da943aad6cdb15140f221e7e5cd8fc454b254d9af8a7749
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external URLs, with several hosted on compromised WordPress sites. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification strongly indicate malicious intent. The file's structure and URL distribution suggest it's designed to lure users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://matricula.arendic.cl/files/rolejuwu.pdf In PDF document text
    • http://xibuhuanyu.com/filespath/files/20210901152626.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/79eb2110dc5166a4cda688ed9aa999f0/71925131852.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/mibod.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/bumewoginujafadilowe.pdfIn PDF document text
    • http://canoto.us/Images_upload/files/54872043010.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/219d87ee67ebb72623b061ac3dd9f760/gawifupe.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/12159838093.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7b35bff1b---27129050535.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/97089771396.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/nidogowunave.pdfIn PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/6574004459.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/jisibumadawonodabakij.pdfIn PDF document text
    • http://parentini.it/userfiles/files/22610499581.pdfIn PDF document text
    • http://pmke.cz/pictures/files/16713248369.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/taworuwonawuwigiga.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/11ed4a0a4d536dbba47fe802d137bae0/jozizoxabirisas.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/pujunub.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/36996507091.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/jodizuzifapovulilas.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/69187605095.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/23448657736.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=export+contacts+from+excel+to+androidPDF 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_off0000d8cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CB 10868 bytes
SHA-256: bf1d7a8a8a4031cb592acf1d6533ef78dfb373f93b53d74906afc0a42f30a9f1
font_01_sfnt_off0000f1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F0 18408 bytes
SHA-256: 8316a5eb0f02122dc7950c0110e6af77c18ccd966f239cd5346014182d09a61f

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