Malicious PDF — malware analysis report

Static analysis result for SHA-256 b597b2066ef0aac8…

MALICIOUS

PDF

82.2 KB Created: 2021-09-08 22:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bb1cd313dd393b9cdebd75e5401e4e23 SHA-1: 72dcae2f7b99bf6689984ca92c9ace888a2a54c4 SHA-256: b597b2066ef0aac8adb11dc149f07703633bbbf76d36161b72311e29caa9ed27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links to external websites, some hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The presence of external URI heuristics and the ML classification strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://queure.ru/uplcv?utm_term=transfer+pictures+to+pc+from+android PDF link annotation
    • https://bselink.com/userfiles/file/95843898793.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/nidol.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/muxek.pdfIn PDF document text
    • https://maturana.cl/upload/file/43885209684.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/68189630783.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/vimudimepulobika.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134add0bd318---dilokimo.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210908_7F3ED4044A2DA28F.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/xapuvanutuw.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/vaxesadepizudalizejun.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/3d899919a4ee616e4ecb9636a4f45418/22645100593.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/51722657908.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/42983169234.pdfIn PDF document text
    • http://fgsconsulta.com.br/ckfinder/uploads/userfiles/files/76646602869.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/wovedilemuzovu.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/sidunozosifo.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/kijumopegafisaduxasa.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/69489564862.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133aa479d1e0---vepoz.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ec1a9df3f---fokawimika.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc5d2d827e---tanepaxowisuzivotifula.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210901_5AECE9156B06A1E4.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/lasubivupamogejurewaz.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/7ec60c87537bb45f3bcb5290d7cad36a/38475063420.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/texuzimivaz.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161369ac5615a7---79241576677.pdfIn PDF document text
    • 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_off0000dcf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF8 10796 bytes
SHA-256: ba9972876ddceff9ce3aabb61b1ae7e6b0ebaa8884a7dffd533ba0ddcf6025a4
font_01_sfnt_off0000f5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D4 17604 bytes
SHA-256: 1524422631dc0fdfd515633683f4143d8b2cb01b86eb65484f81cadc26236781
font_02_sfnt_off0001233b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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