Malicious PDF — malware analysis report

Static analysis result for SHA-256 7424da4e5b3f07c3…

MALICIOUS

PDF

96.7 KB Created: 2021-07-21 17:35:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a8b86b5505649a6254406b0c776b4f3d SHA-1: 5d4d6ae9c9110721d767db155e0020217226465f SHA-256: 7424da4e5b3f07c391f52ea779b84a1923f123203d0ad6ce4f908441ffb6a713
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple distinct hosts hosting PDF files further supports the link farm and potential SEO poisoning attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/29c5a1a574c050cb24d959fbebb05ed3/mofajitun.pdf In PDF document text
    • http://memphiscentral1969.com/clients/865565/File/ragunenuleb.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/fizafiromabatulike.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/lusifufanijepukofelamu.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/c82edmdr7tab77ev4iqvu850le/78416484252.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/258a2fcb43f8e6efa4998f336e82c98d/98480532267.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/d4761d16caeee93904e778c8b2486590/lozubemawuzixasumowegu.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/qsc2k624smid89urje64sv8r4i/91761250610.pdfIn PDF document text
    • http://webbuilders.com/files/file/gegosebufezabaf.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/j4vn56ot6qcarvegbmil5isdhv/86759765.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609630f0b3dd7---zepajemeginigunotizemu.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160892ffc2ed97---5249866461.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/wugudivuripoge.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d367b376e3---jaxujowudatulokideni.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/livurax.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/37818274124.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/fatizowurofovaxeset.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608053fc7c4d3---86733864284.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d8111b49ebc---jipepiwudofamavifupar.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/gitizuk.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607edce1045b5---94455056400.pdfIn PDF document text
    • http://jimigubellifoundation.org/clients/f/f9/f96c94eea877db95ad0a8b6fd709b1ed/File/sabovamiwesamebav.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace624a5f9b---memosisalutirojasupulivu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=harris+quantitative+chemical+analysis+8th+edition+solutions+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_off0001107a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107A 17628 bytes
SHA-256: 85740763063f66bad500f12eeaa92d51a5dd0e929ef84f3b8de349a72d737b6e
font_01_sfnt_off00013e63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E63 11508 bytes
SHA-256: 3c7223fee1a137c710a807f521a3db486dc96d31dfe91ea3e35083cc1c83b06c
font_02_sfnt_off00015941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15941 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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