Malicious PDF — malware analysis report

Static analysis result for SHA-256 19fef41403c4043f…

MALICIOUS

PDF

84.9 KB Created: 2021-09-17 18:21:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3368a18179b34418959e5bd620225999 SHA-1: 3128defb769fbafa0ad5cd65967cf3a9cf0fe268 SHA-256: 19fef41403c4043f611f20a9349ff180564b18e42a638f8c06788094c9124183
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, with several heuristics indicating these links are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL findings are sufficient to infer a malicious link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ingegneriarossi.it/userfiles/files/29190659240.pdf In PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/kowapagerat.pdfIn PDF document text
    • http://bajkolandia-leszno.pl/userfiles/file/lijogelu.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161449eeb5228e---57535024016.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/76749627928.pdfIn PDF document text
    • http://vongtaygiay.net/media/ftp/file/6629310213.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614352f507b79---435718793.pdfIn PDF document text
    • http://unityproductions.com/upload/files/mizofezufixavupovoju.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/xasiwowo.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/47948694133.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210903202009.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/5605635373.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/wumemijudodosavame.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-15/20210915221109607142.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b18a7cd4a4---bidip.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/kavoxapawobetasagupaxire.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/mafebezizodiben.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/felizufevadadibekujib.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/fosokaxoximajalogoravidez.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/xuwozuwem.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/xuzodulimubobu.pdfIn PDF document text
    • http://sakem.org/userfiles/files/zubukadogud.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/30768074108.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/69486491313.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=use+your+android+phone+as+a+universal+remotePDF 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_off0000e6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A9 10944 bytes
SHA-256: b86bd48205e2625355a7fc6bba581b365458540bb526c88fb47ee2068cb56241
font_01_sfnt_off0000ffd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD4 17620 bytes
SHA-256: 3be54566b0180ed4630b0b1c49395ab3fc6977e15630aa5fc7cb48f52c28624e
font_02_sfnt_off00012dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1