Malicious PDF — malware analysis report

Static analysis result for SHA-256 f41efb7aa0f1c242…

MALICIOUS

PDF

79.1 KB Created: 2021-09-04 19:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c2b2b3a995facf503722fc2bd01bf477 SHA-1: 109b400f62a3c0c5c43594c130800a176e0e2ea7 SHA-256: f41efb7aa0f1c242bf9eb6ebe1a8aa234e25b645c4f127a2e6e0df7a51fb8366
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure indicate an attempt to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/jabogexoxawisabopavujugas.pdf In PDF document text
    • http://china-hold.com/UploadFile/file/20210531080013698.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/93460651964.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/833fde84b522f1afe62cffdb60b23a42/12252397101.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/8708ed3933f3e117fcb25db25ac5fd1c/91639771318.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8a5564301---vedakifometi.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e9bc16ac8---wumopawisokuvujitonis.pdfIn PDF document text
    • https://activepymes.com/pub/file/nibamimok.pdfIn PDF document text
    • https://tigapilar.com/upload/files/56648479183.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/33392557830.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083bafaa2b0d---tepubofi.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/waxopotadi.pdfIn PDF document text
    • http://tongkhomica.com/upload/files/gipopikutenage.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/13489842280.pdfIn PDF document text
    • http://www.puhito.hu/uploads/tavegavujizido.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/960af22a255fa7232c236137c3687402/babazoxoxovopuvebeposuwa.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/7261126508.pdfIn PDF document text
    • http://spiregene.com/image/files/20210627_165211.pdfIn PDF document text
    • http://jhferry.com/data/fckeditor/file///40454917794.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609c008582ffc---35309885789.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/sarulojuxereweje.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/pejezavuvufiweko.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/98007224077.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/zukufofirivufujake.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=pycnometer+method+pdfPDF 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_off0000d408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD408 16676 bytes
SHA-256: 63808edafb0abb184626442ea8c583fcfeb9e3508328d84a57a39168fbf83fcc
font_01_sfnt_off0000ff09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11720 10532 bytes
SHA-256: 7cbfa4fad163d55eb2c47c9410f57726bce1d9e8f986109d3233c7218fe6ac8f

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