Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ee608e6efd95f8e…

MALICIOUS

PDF

89.7 KB Created: 2021-09-14 14:26:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a2e382ff0739dea6e7eced4421210465 SHA-1: b2b0943c0d89844566d47e5a0a20f14044277262 SHA-256: 1ee608e6efd95f8e906871e81100cce0fa0e5445e01046252e81c72ca609c19d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 https://nisahanpin.com/calisma2/files/uploads/24450583737.pdf In PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/16f8b029ef80c8f2e4af38f4961db69f/34343674054.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/83362325952.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/49230359698.pdfIn PDF document text
    • http://baove247.org/upload/files/4280971230.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/teferisusakijomerawepiki.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/pinitimedizemux.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/82242047863.pdfIn PDF document text
    • http://kccmaul.com/files/files/koxufaxexixavonuvu.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/menagezudupexalekakuzipuf.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1630669512bVQp.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/96851144403.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/27492683018.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/64756685384.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/af9a5819cafda390a1144527e529f8eb/tekerabol.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/walimukimoruvamesejex.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/9ucippbdrm0ouc46hehabdsjs6/pusulipi.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/73556627521.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/99934559377.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/82809665258.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-7/20210907015538906785.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/f5a4d265d5c600de1351ed4aa113565b/gabegizepijuledeka.pdfIn PDF document text
    • https://kakakmanis.com/contents/files/47926751080.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/kugukidepe.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/36965104071.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=best+link+to+download+moviesPDF 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_off0000fca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA0 17220 bytes
SHA-256: ac7b26430b4b08d46f5608bc5a5c2743c8cd8cea3329bb1c583d4dba021714ea
font_01_sfnt_off000128ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FF 10608 bytes
SHA-256: bb7558b22a7b0949f4a5307230c313f12b4259106c73ed92f1989f718b79d5c2
font_02_sfnt_off00014151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14151 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1