Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ee62a7773fccea0…

MALICIOUS

PDF

76.5 KB Created: 2021-09-13 15:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9c3d1c9ae1a9ff1f23a8071ad810fc9b SHA-1: 83cbb9aa48d89c81b064f03dd7138dfc54fcc229 SHA-256: 8ee62a7773fccea06db03d02fd1eb90974608d75d9cd8ba30f40639b9ee8fa83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF 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 pointing to compromised WordPress upload storage, suggesting it's designed to redirect users to malicious content. The presence of numerous URLs, many hosted on disposable domains or compromised sites, reinforces the attack pattern of luring users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0cb202c58---24882687487.pdf In PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3c185d640---jugurubuxadataniwod.pdfIn PDF document text
    • https://cukimentescukraszda.hu/files/files/15992666083.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/93159999163.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/laropun.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021090907564350.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/1f7111abb599164d896e66ab11f176d1/56774515046.pdfIn PDF document text
    • https://teamcode.net/upload/files/xeginuboliropozurif.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/seroxogefebasuxaxed.pdfIn PDF document text
    • https://casaalu.com/luutru/files/vefelijifi.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109010334002716.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/84235534505.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/tonafowa.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/gevodufifezojegudogezus.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/vogotarapiz.pdfIn PDF document text
    • http://sbmhavacilik.com/userfiles/file/sikejirububi.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/jesunetakiziwadirinev.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/gilije.pdfIn PDF document text
    • https://giaiphapthietke.vn/media/file/files/mazemuva.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/71750972412.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/76905912522.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=web+call+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_off0000cbc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D5 16540 bytes
SHA-256: fd394d574de7ca2bdd61d2005a3f3cd2bf917dce40985a0655507eab0f168d7a
font_02_sfnt_off00010e3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3F 10228 bytes
SHA-256: e6f0cda697c0941fd3ae2c25fe6a4d95adbf183505b3e3dad24857ae93c68f86