Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dc636cc5aa5ca13…

MALICIOUS

PDF

69.1 KB Created: 2021-09-29 12:37:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 03619e1bb5599400fe2552cdd0ad037a SHA-1: fd25e4bd8210ac3d71c2e6f77cd147c0538178cd SHA-256: 9dc636cc5aa5ca13596dd06c5cc8bfd956c0889dca2025e53072c6c80d61e74a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple disposable hosting sites, some of which are compromised WordPress uploads. The primary goal appears to be to trick users into downloading further malicious content via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://d2dgroup.net/upload/files/finorak.pdf In PDF document text
    • http://www.miyadenthai.com/image/upload/File/bifozewijoribeletem.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/15972753000.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/zalaxeruziras.pdfIn PDF document text
    • https://keepingscore.org/userfiles/file/tuxitaxilo.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/vipupuvisojiwenulolatu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613887b90fbbd---bikolozelojowav.pdfIn PDF document text
    • https://812423.qqtogeljackpot2.com/contents/files/banebura.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16145b4c46846e---ditejuxobikupejirujufik.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/poxopigomatadid.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropadefutbolbarata/userfiles/file/28574183321.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/vexapufajuw.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/rerenasakuwudabonobaw.pdfIn PDF document text
    • https://probidjp.com/ckfinder/userfiles/files/20210914_014409.pdfIn PDF document text
    • http://megalaserasia.com/upload///nijititilagixigikemol.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lanebewafoz.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/55584479746.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/20773391076.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/89d0bfe3d613270bd38d00fc0f44a748/fezotusumufetikagulij.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/wejewoxim.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/52633230364.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=tamil+dubbed+movie+avatar+downloadPDF 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_off0000b186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB186 14672 bytes
SHA-256: 4da0c56ab03f694fa1cfc77bfec13c60eb559a75f0b277f8d0a1da23ff51448b
font_01_sfnt_off0000d653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD653 10596 bytes
SHA-256: 1535eb9d449db13bc8f55ba3d3205f1c082ce5663f696598368bfef4ea0c7681
font_02_sfnt_off0000ee7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1