Malicious PDF — malware analysis report

Static analysis result for SHA-256 95b16c0c676dc4bd…

MALICIOUS

PDF

76.1 KB Created: 2021-09-18 02:37:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ddb68e6619ae21bc7d92d7ed5cb7741e SHA-1: 1b3d7b68ceaa294f34388a993113d2920a54eff4 SHA-256: 95b16c0c676dc4bd9a9f73d00481d2d221e46b9793d376f40fdfde30e50fdff6
156 Risk Score

Malware Insights

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

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 embedded URLs pointing to disposable or compromised hosting, likely to distribute further payloads or phish users. The document body was unreadable, but the overall structure and URL analysis strongly suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://siamsnail.com/media/userfiles/files/25535239053.pdf In PDF document text
    • http://ruihuitax.com/files/file/ketikajezonufolibaju.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/goxinedavakimuduvaxi.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/4738448060.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/webakamib.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/xubipoxete.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/93437114234.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b60ce13d75---60137475225.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/78469714023.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/xugugigefafupakefenubawuj.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/nunupu.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/500770b0a87de8a6744ce8695130acbc/50444351830.pdfIn PDF document text
    • https://ekransamara.ru/files/87343712827.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/51458784999.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/86064827089.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16133f8c2e55f9---17439709148.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/90760243496.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/91299180019.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/49161240308.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/48416914901.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/5b91ab228849b616d675b8bce7c4fe71/12844868272.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/1452316333.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/73685573670.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=roms+god+of+war+2PDF 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_off0000c5c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C3 17720 bytes
SHA-256: 2f9fa7ec781b606e0d486c913dc8caf24d34f4d612c95cdf0320f677f9661e82
font_01_sfnt_off0000f3c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDC 10476 bytes
SHA-256: 63b53c4b5eaf23cd9061fa639234e54f3e13a23b656292944768a30feb3bfb84