Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d8109f9d580078c…

MALICIOUS

PDF

82.8 KB Created: 2021-09-08 07:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 97fafb588915cce285cf2a21591d8d4b SHA-1: c521c339f0a2107737f7e502e691292389edebfd SHA-256: 2d8109f9d580078cb8918b85fc60d9e79f97e672e7dfc66fca066c9ed0ddabce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to external sites, some hosted on compromised CMS uploads. The document body is unreadable, but the overall structure and URL distribution suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://nanyangtextile.com/userfiles/file/muzaviwarerixova.pdf In PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/pivabixumeg.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/dimuzepave.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/25ac62b64253f2a6d5781a19c5f89734/20910058981.pdfIn PDF document text
    • http://dzwigipoznan.pl/userfiles/file/6599596397.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/70096677213.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609456cf9a3c2---78450476665.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/jifefu.pdfIn PDF document text
    • http://laduses.nl/image/file/90697851105.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16088336885cc6---fukedikoxi.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108139bb44df---14880801763.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/9c9681df983783804d1c13356c82b078/fikejamevob.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/4550227170.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/76184970676.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210827120646.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/13114683.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/bf9cdfbb83f722bcd14d3c7eb11c6cc7/75793400297.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/a09bf395948704d4414ff06345ae7a3d/nirovuru.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/45808781145.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/v75ropa7l6i0cfulnib0tb8bu2/gukajojagawabejakop.pdfIn PDF document text
    • http://wawa757.com/uploads/files/wunedimobunosuzajebikus.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20218518008964.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608caf507c25b---17813777740.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/sjt7obojpkc9l25uv5j3nfgb9p/fupujuru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=corticosteroides+pdf+2018PDF 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_off0000dfa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA4 10832 bytes
SHA-256: 87b00d53faadfed66ce0b587ba7c617ecfc15483f0cb9eef238bcb374e117172
font_01_sfnt_off0000f8d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D9 17244 bytes
SHA-256: 2f13d0a59ada42c3b177bf606352c0866c0a9c0a5866bab0a1bac2f76ab9a159
font_02_sfnt_off000125d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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