Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea403636aa32894f…

MALICIOUS

PDF

82.0 KB Created: 2021-09-17 14:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 143d2a0e19cafd631e8d8337a289aa45 SHA-1: 881a9f2df7b2a68e91fab6510cbb2e5ca49034e5 SHA-256: ea403636aa32894fee57bec11c6982ceee4ace7168efe456af35cfa885c902dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to potentially compromised or disposable hosting. While no scripts were explicitly extracted, the presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics suggests an intent to lure users to external sites, likely for malicious purposes such as phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://emeraldcovepartners.com/_data/images/file/45641400255.pdf In PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/2929467284.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1613083a8f38db---tugegovuzix.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/64186329709.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/tefozapuxogig.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/zudexewi.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/69045902124.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/nosoxiruk.pdfIn PDF document text
    • http://www.moyekolodin.com/files/16567103611.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/42e882efdca4a081e4d0ad04036af758/9974907355.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/niluruzalatigereda.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/juliwi.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/35210453717.pdfIn PDF document text
    • https://redac.ch/upload/55974310585.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/sutokawabuzo.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/rejuwusabo.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd57b5a1ea---xeterabewak.pdfIn PDF document text
    • https://huangs.tw/uploads/files/202109121231149477.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/29629712179.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/nibefoxov.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/34016709374.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/84343602189.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=sound+notifications+androidPDF 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_off0000d978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD978 10468 bytes
SHA-256: 337e31097a7a4dd35c71edfb34ce0ae13bbca85861ad4bf8f1223b493d7835cb
font_01_sfnt_off0000f15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15C 18848 bytes
SHA-256: a988368242fdd9dc1c38bd9ab40218bab5a8534c7036c6d9a1afd0f0fb925882
font_02_sfnt_off0001223d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1