Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc61e906cd0b1ce7…

MALICIOUS

PDF

84.5 KB Created: 2021-09-17 11:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 820eb46c8e962043efcf4b4816b314d2 SHA-1: 35984ef13fdf6c496f9db38cbd874af9e3bda4d9 SHA-256: fc61e906cd0b1ce77db31e392e44828fa76425ce66428311b5b51e144453aeee
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The presence of a link farm pointing to multiple distinct hosts, including compromised WordPress sites, further indicates a malicious intent, likely for phishing or malware distribution. ClamAV also detected this file as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sdhouse.info/ckfinder/userfiles/files/porigevoforemu.pdf In PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381eb7d114f---95620060547.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210917055542.pdfIn PDF document text
    • https://interangkorcondominium.com/userfiles/file/44017499314.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/48158911412.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/9821268372.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/farufiseritorodeverid.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/fsqarokl6b6ujlq20163gk2422/tefofojavuzapavuwese.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/miwetobemusedu.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/24244153137.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c9b133562---47491652972.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/70630612635.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/wumozojon.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/sezizoj.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/biralafigojavo.pdfIn PDF document text
    • http://gyogytornasz.hu/editor_up/doxezolagebugabamividu.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/38555933493.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/rirumabogarelet.pdfIn PDF document text
    • https://medtek.vn/storage/file/37836564041.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/46925885678.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/76663366753.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/fupuxuxozikigasotedevevu.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/rotezutigezenap.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/nidavunimixebobol.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/19356337885.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/3f7be4b935f741208b498fed5a72dc5c/fonowep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+remove+screen+lock+on+phonePDF 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_off0000e26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26E 10620 bytes
SHA-256: d71da22cadff67e6555ca03ceaeac064ec0fd23b1993b325d9f7372f3b0149c4
font_01_sfnt_off0000fa92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A4 19248 bytes
SHA-256: 65b6bd3dc3c5de8dfb2b0e92de77ac511a2b1bc27437eca85c960aacfd6625c0