Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f5a037c62d4e800…

MALICIOUS

PDF

68.1 KB Created: 2021-06-24 16:48:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 29530354537315e60e049e29ebb11a6f SHA-1: bea0cff650004b487558e8692cbe153857da3f39 SHA-256: 4f5a037c62d4e80092bdb33a0883867cd39e7c755601d2eba4d62ad1c3b628a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. The document leverages link farms hosted on compromised or disposable domains, likely to redirect users to malicious content or downloads. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to exploit user trust through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://annjulieskarpmo.com/userfiles/file/18817698134.pdf In PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c39864e8955---jedax.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608848f15fe83---74859842575.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/75119905697.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/aulupeiev79hgcsdnf1np75g39/widavetizogugeje.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/bugasakosinesedo.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210508093025.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/62074604707.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/66024843511.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606ced7471496---35247026018.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/3be25a5242e5b672cd356831db87ae96/zibovawi.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/8eb3c08347292444d3ad91a53f95f6b9/toxibikezen.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd781b6749---wavodexupote.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/70823974726.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd9663a6a2---84807367285.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/fixomififojepuxav.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=ingegneria+ferroviaria+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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5A 4996 bytes
SHA-256: e6d19c915f967cc23243c74f967b1fabf5b87d53ef8c22c517bab94d4f2dc607
font_01_sfnt_off0000dd77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD77 11680 bytes
SHA-256: fb3823097b799d6b8b25f98ca7804ec24011234d88cdb9e8b565816e108a84e4