Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2a4968ee5337f9c…

MALICIOUS

PDF

71.6 KB Created: 2021-09-26 16:20:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6eb8f0037e2d6a982537b59b6ff8bc20 SHA-1: c0ce6f60e667e720e242504f2b7bbe46d47d9646 SHA-256: c2a4968ee5337f9cf2cfbcda7bea195e18a4bbfffe054ae7cf13ae82d8ee05a0
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicates that some links point to compromised WordPress upload storage, suggesting a potential distribution point for further malicious content. The primary attack pattern observed is the use of a link farm to direct users to potentially harmful sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • 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.
  • 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://catamma.ru/uplcv?utm_term=english+and+persian+dictionary PDF link annotation
    • http://kanchanaspa.com/ckfinder/userfiles/files/93348894277.pdfIn PDF document text
    • http://surausa.com/uploads/files/rulewer.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/97475851040.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/juzajatezudujomixere.pdfIn PDF document text
    • http://potya.com/pilumefewibagipimowuxum.pdfIn PDF document text
    • https://www.anoregmt.org.br/ckeditor/ckfinder/userfiles/files/jusafutavapokepajuz.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/feruxatepudosebejomabukex.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/36544536311.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/24764906077.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/20805602944.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210901_064601_195.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/65918212398.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1614aeee86254a---59313139646.pdfIn PDF document text
    • https://istanajp.net/contents/files/xadenigonirozujejogi.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614f8e58ca30d---46290030585.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/zazukatekodoxazijof.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/b76555854151fe2c98c0639f21144e54/tajakep.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144f2305a20b---2247793009.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/jaweb.pdfIn PDF document text
    • http://neogmbh.de/www/sites/default/files/userfiles/file/46818534322.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/lkqk9qufrtc9th2r3qub0i4627/nawusoxefir.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/gugatumizabegux.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/1600641418.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/81774317383.pdfIn PDF document text
    • http://tjchenxing.com/filespath/files/20210910174940.pdfIn PDF document text
    • https://hkki.org/userfiles/files/valekudajosatununijar.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_off0000b621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB621 10892 bytes
SHA-256: 9871e2efe46ccbc1ed1f5f5d49b9dc9cd874ca2ff93a95e11598d24ed8416647
font_01_sfnt_off0000cf0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0B 16216 bytes
SHA-256: 71a59bc1ef00735919ee78fe3919f9abd8975d6ee71436ebaebd0735b89c0d0c
font_02_sfnt_off0000f860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF860 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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