Malicious PDF — malware analysis report

Static analysis result for SHA-256 1afeee77071c62c4…

MALICIOUS

PDF

81.3 KB Created: 2021-09-07 05:37:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d26137f0af91ed19cd334997aee5f1e4 SHA-1: 08dc8a8c915e5070a492a50b6c44dfbda303b749 SHA-256: 1afeee77071c62c4ebdb80a6f70512ef409b5a55454c7130ee6fa749315997bf
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites, indicating a link farm designed to redirect users to malicious content. Heuristics confirm the presence of external URIs and link farms on disposable or compromised hosting, and ML classifiers strongly flag it as malicious. The ClamAV detection further solidifies its malicious nature, identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://irlanc.ru/uplcv?utm_term=capitalization+practice+worksheet+answers PDF link annotation
    • http://music-saikung.com/ckfinder/userfiles/files/zofubevekujejutube.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/rusukorezatofonod.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/dixifakapegu.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/mezesoxekonalagefoxud.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/61934231519.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/lubojerazi.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/kiwonu.pdfIn PDF document text
    • http://co-mit.com/uploads/files/lokini.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/2467976306.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/giwixoga.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e40d8cca1d1---bupanekulifabog.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160d6d1c0789e0---32441663308.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/wijeluwogule.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/rixepaxu.pdfIn PDF document text
    • http://novichiha.ru/pic/file/vomukogew.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/nc5dh2ofdniase76laobpu28te/vevunizanun.pdfIn PDF document text
    • http://sartor.ru/upload/files/6577548539.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d844d43992---4370441514.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/rirup.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/kiloxuwemupadebapukizin.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ac66f8b3fa6---15983287658.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6fc3ae01e---retuwekewog.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/4umc6a09ho6jp937uv63kces0h/9156109506.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2325633df3---fivutitibew.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/69160760103.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/64c08c8c6a15a1246bd8ba5f689523ab/33765309393.pdfIn PDF document text
    • 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_off0000d5c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C5 10740 bytes
SHA-256: 968f568cc8493bd67f1031b5a1b2a61ca6aff6ae2c7dd68975d0ac49f89a3327
font_01_sfnt_off0000ee8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8B 18264 bytes
SHA-256: df20262c034cdce10813b6050710967a42bc1d7e6ddd7993ade0c78aeb6b7de3
font_02_sfnt_off00011da9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1