Malicious PDF — malware analysis report

Static analysis result for SHA-256 e27d5a0fae8f40d1…

MALICIOUS

PDF

82.9 KB Created: 2021-09-01 09:35:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a685208a700c7770458b4ea13d620b08 SHA-1: d915eec96ade21fb79187680f9f854b11d271de8 SHA-256: e27d5a0fae8f40d1d38a4f32e4c9207697150154febd5c901b220ab540f7e8bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as 'Pdf.Phishing.Trojan'. It contains numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca1f8821d7---zogopusexapibuxunoxugalem.pdf In PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/82868906386.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/lutezavabigiputikugoxo.pdfIn PDF document text
    • http://beergolfers.com./blog/images/file/duzotozagopazubuv.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/15709979581.pdfIn PDF document text
    • http://splogservice.ru/content/file/23154823865.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/pumuwejaduwivufo.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/ob4q83tr0ikqoubcks2fa1den9/92475112284.pdfIn PDF document text
    • http://luvnchrlysenglishtoys.com/clients/861429/File/zujoluduzoretetodirove.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/86629694807.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e978ab6c6---gusunopapimezewev.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/66195008044.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/7e4c3940072dd2059ddefffde486ae19/fowipurukewojomipow.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/340ac45cd09e8a199b45f61f82875d57/nanikumemeviwujop.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f631e62cc---luterajipibi.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/sagowakug.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/xorobomaxusawonim.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/8c44eae81fcb92aa72f818a81bff293f/wakasino.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/buboripulurobal.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/lakuba.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/42481428771.pdfIn PDF document text
    • https://businesslife.com/content/file/gimokasel.pdfIn PDF document text
    • http://haniltm.kr/upfiles/editor/files/43231679612.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/4d8d725a233b97caf840d83bb3bb473d/62192927897.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/f831191ff1b91d5dbd51c1054cf8d1d1/9165124149.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=free+printable+thanksgiving+word+searchPDF 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_off0000e07b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07B 11152 bytes
SHA-256: c4e4b9ec617fa673194be73a2452aafefc1395e335dba05cf44511fa3d294133
font_01_sfnt_off0000fa17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11229 16772 bytes
SHA-256: b4964868000a5ac2a497cd607389fdb816b63ecff23ae017777af2c67f982711

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