Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a6db4d623cca2f8…

MALICIOUS

PDF

92.7 KB Created: 2021-07-02 19:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b6402c5f68143db1224219f42c45733b SHA-1: f4c067d1586f6e44cb2732d30be89152dee368f5 SHA-256: 9a6db4d623cca2f8ad8f2e411c8959f9a2c4976d21e7269f48f06b02cfe1f680
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal that the document contains a link farm pointing to compromised WordPress upload storage and a visual download button lure, suggesting an attempt to trick users into downloading a payload. The presence of numerous unknown URLs associated with compromised CMS uploads further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716d453d4b1---welejajupemejoku.pdf In PDF document text
    • https://bestofbucerias.com/upload/file/94269268539.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71137970425.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ae03f2912e2---7015964567.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098364ab638e---dubevopusofogu.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/dixepilawem.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/jogusiresibuzesorusumuges.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ca4a69e8461604e114b5fcb75dcb4fc6/wuwixibekisimev.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/28e303751db0fc70e66a257da578bae3/dujuvisuxig.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/zexadotarivuxafifi.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//60169790613.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc9a4bc6a0c---17025151526.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/19742505735.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1622939212.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779fb29625d---mixebu.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/9o9c11ujq56hecea365bad7mv7/15443417165.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/d1cb8ec3223a715e0256df59f79bd780/vezedodubepisikawox.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bce1fd8af1a---xajodufubipo.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/88886267104.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58f7bc7bff---88336324076.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/49263593937.pdfIn PDF document text
    • https://designclarf.it/file/52824082881.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d482dadc955---28585405674.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079038a65fcd---27622925371.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/40f72e94f89baf08f5a046ab94caf7bf/rapudapevuderifajekolidu.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/75086768930.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=secret+neighbor+android+downloadPDF 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_off0001081f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12031 16992 bytes
SHA-256: 2b4709b4352577ddc59f11064eb7541bbcea2cbd0cff32bc8ccfb199d0c49e1b
font_02_sfnt_off00014ca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CA3 10780 bytes
SHA-256: 301d3eaf0b91da74b0f1e3954027f8d13e9c46b75848d653510fab9c80b12a67