Malicious PDF — malware analysis report

Static analysis result for SHA-256 f56e8d3c586004a4…

MALICIOUS

PDF

78.8 KB Created: 2021-08-21 12:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: aeb7b1744c9ef365283d4537f84c221b SHA-1: ccae39a73813698e2b0ced3efbc8d4126fd6ebeb SHA-256: f56e8d3c586004a4c9286f2422bc4f80fddd64e5baee46fba467278eef0e2e2d
176 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://remaining-mc.de/userfiles/file/futerutizus.pdf In PDF document text
    • http://arunimaflavours.com/userfiles/file/53830858543.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1e5830ecf---rojuwex.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/31054847723.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/pasubawiloxinonak.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/54485428169.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bd817227aae---tofuni.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/gafafuwozujotowu.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/gudasabunagosodu.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/91551613094.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/34117125266.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/vugigatopaxe.pdfIn PDF document text
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/vakalelejogabus.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16089fc7817fa8---dobijexefo.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad496d77c7---9603769266.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160c377c186d33---sisalabexitakilotazedojag.pdfIn PDF document text
    • http://prosquash.by/data/gunikapisobepube.pdfIn PDF document text
    • http://wenxuezj.com/images/File/kazomesugibaxuwuwigewiza.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/sabejidudakilekiko.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/kebirujiwiso.pdfIn PDF document text
    • https://reniuved.it/file/25940850562.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4feaaae67---96770460098.pdfPDF link annotation
    • https://sahyadrisevasanstha.in/userfiles/file/16005888630.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/zikodegakabomakumupej.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/zegozefasadakigukal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=vw+golf+mk5+gti+workshop+manual+pdfPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/81396665299.pdfIn PDF document text
    • 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_off0000cf86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF86 16868 bytes
SHA-256: d250e2c0bd37965ef3faabc8c9cfd3d7a4326aa0c2db7709e248186060774bdb
font_01_sfnt_off0000fb99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB99 11192 bytes
SHA-256: 9e02d250d8bf156a9dcc248b9afca6ee1a5811f2e76b577512543f59a8ec2d09
font_02_sfnt_off00011578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11578 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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