Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7608da6018384f4…

MALICIOUS

PDF

80.4 KB Created: 2021-09-21 07:01:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4092be7a7064b30b0eded695617f06ee SHA-1: e4310e5cba09639cbff5a2420991d580e4e88c8b SHA-256: c7608da6018384f42109506dd095c085b34a71baf47745afd128311a2ca2541e
196 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the presence of external URIs and the nature of the heuristics point towards a phishing or malicious redirection attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://archism.ru/uplcv?utm_term=android+wifi+slow+internet+connection PDF link annotation
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/61777481992.pdfIn PDF document text
    • https://rumputhijau.com/contents/files/kamejaxotutepakexivebu.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/wurejirulurujirejubop.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///zokifuxenepaxiwokedezem.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/nidifiwasanitolom.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/kujuxogulagotin.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/161350f84dba0d---sazunuj.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/megodu.pdfIn PDF document text
    • https://businesslife.com/content/files/waginax.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/95249159437.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/jusanaxerudimozolutupav.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/bebunulepufidoz.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/xuxavuk.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/85710176161.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16146045bda82b---nobapadomijukefebe.pdfIn macro / runtime command snippet
    • http://epilia.com/upload/FCKEditorfile/86906610098.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/69943653216.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/dipemunepinafibugi.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210902_0137C7B95041B289.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16142accbeab72---35887812119.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210914121545.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/vetulijezizagimejepej.pdfIn PDF document text
    • http://360global.ca/userfiles/file/bemexasunafawubigobo.pdfIn PDF document text
    • https://editionsitaliques.cIn macro / runtime command snippet
    • 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_off0000d783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD783 10372 bytes
SHA-256: cd8e9c1346c2699063526280e84d165b8be519692b7f91f2a55adacd88185e33
font_01_sfnt_off0000ef24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF24 17032 bytes
SHA-256: 74c36f8e99764cd4c33d3e94cc028a8f1b217a3aba1ab14071e20ac94088cee7
font_02_sfnt_off00011b88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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