Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe577244f16de032…

MALICIOUS

PDF

85.4 KB Created: 2021-09-03 04:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 51476b638bf22a6528e9a5a4c344033a SHA-1: 8431853d00b1a7d64c7c83dc39a554e9c6723ca4 SHA-256: fe577244f16de032f4c192c2e1d8813bf95f3e5ef42a12747f099635c8bb69e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates an attempt to leverage external resources for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://jncs.kr/page_data/file/20210710150247.pdf In PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7cb7a2a35---bedapajinar.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/33773975d0fcb295a3de5d4ab491f880/9665976422.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/91510166711.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/361b6b640953dcc368f1632de105e51a/xenigefato.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160835d80db4d6---gakibirisubilaju.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/4e2fd2b2f24142d3e1e013506eae93f5/remubejikazugudewebujaf.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/radilijogejinawu.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/ridavokugifemijomolada.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/75640683531.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd811e218a1---givodawegaga.pdfIn PDF document text
    • https://airshow-bg.com/file/40028284807.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/zutiborowelu.pdfIn PDF document text
    • http://ashioke.com/images/library/File/96876935777.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/86579472042.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3bbd96e9d9---juduf.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/90898154044.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a28b4c4f4f0---kutagenewigemivifupifo.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/63c8ec95771f6baf6d9d3aab4de82c50/vemanotedef.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/vefezidupepavokozit.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/titub.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/1jg2vpbtae4ml1593idgh65pgk/7396576173.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=standard+enthalpy+of+combustion+table+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_off0000e2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000faeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEB 19244 bytes
SHA-256: 5b78947f3c82ca24c3ae09cfcef7501737237b102dea6aaaf450d608d476f5f3
font_02_sfnt_off00012d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7A 11312 bytes
SHA-256: d9cb2ff4522fe0b1722e0320a8db1e8206634391a7684858a3ebd0a9ba5b65e2

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