Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c3fc225c2caa7a8…

MALICIOUS

PDF

98.2 KB Created: 2021-08-16 08:25:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e0b4cb066c1e9af6a16a22f857b18821 SHA-1: cecd3e48d33a8ba9bacb08d85e2b76bcc59ab59d SHA-256: 2c3fc225c2caa7a8fd3beee37c08fc5546fbb361287f1568697234be1244968b
156 Risk Score

Malware Insights

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

The sample was flagged by a ML classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains. The primary purpose appears to be directing users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://senfina.top/uploads/files/vizotamekomaletux.pdf In PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/46923587754.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/81186883004.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b03af19890---25705468762.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/ba30bb09b267d0e536fca4c088097d61/6241043870.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160946088f37da---4682080656.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/59466363604.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c4e8d5c2c---bomawal.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160896c7ccc4d4---8664245452.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c34a46aa84b---jixoxun.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/56533571133.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/povamufeno.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/0dgviv3e8vpbimug9c7kjsp3ig/73507695294.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/hn42f7rt7pq44qfuc5r8trmot8/50232952172.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210706091758_d3VyYXY=.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074468557bf0---46534268753.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/solemidu.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/bujakijakemu.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8fe3812df---62437397516.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/pugasorumixit.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/4ad239e02eff39267769802d8da2fbce/83144634479.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b05fe0e1ae0---nusinonar.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/radawigara.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/zakimotavofu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=banking+and+financial+awareness+september+2020+pdfPDF 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_off000117a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A9 11456 bytes
SHA-256: 3ef3e2cb7ae99b2699db72ae634e6d99338dcfb18f1e3d93a9b8e0d73d1cb666
font_01_sfnt_off00013271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13271 17444 bytes
SHA-256: 31df83e6f32183933253a766eaa773a6677a006c894c0e02dbcbd4a009b7434a
font_02_sfnt_off00016063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16063 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1