Malicious PDF — malware analysis report

Static analysis result for SHA-256 622f21bf5767b05c…

MALICIOUS

PDF

81.6 KB Created: 2021-09-10 04:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cc5a686204f04455ac1c2e6bca400745 SHA-1: fb4a3faa938f3dc811009a2b0e3095eacc056114 SHA-256: 622f21bf5767b05c57e6bc5d214beb854c755661e4370c76ac50dc4809cfc862
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://anquocrealty.com/uploads/image/files/jumolepopolunofurolim.pdf In PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090305555316.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139fee9c7a68---posaduvarex.pdfIn PDF document text
    • http://methese.com/upload/files/lobafajurulufekalupa.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/84597866104.pdfIn PDF document text
    • https://togeltop.net/contents/files/73273869179.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161367b22f34fa---pemukaxuwaxigogonajev.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c6cfdf479---82119861605.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/wabujefedusamopi.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/85875429780.pdfIn PDF document text
    • https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/768173452.pdfIn PDF document text
    • http://roberlo.cz/www/files/file/83960367127.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/vetokuworidez.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/xolosedimegulo.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/e4fc7e6c3de22aad81a8cdb5a1b3e8aa/60469646552.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/73712147155.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/rosebilebox.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/pilukejezojasixowuzulopoz.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/65800666798.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/642723d8339424d9e7a34370fd2612c1/tujibinilako.pdfIn PDF document text
    • http://cartopack.be/Images/file/bilamodez.pdfIn PDF document text
    • http://bugskin.org/userfiles/file/takezibag.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1630613516.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/17855961152.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=blood+promise+read+online+freePDF 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_off0000d942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD942 18280 bytes
SHA-256: 48cb594682d0cc76c23e9c2f86203f07987421cd69229688c23d376f86bacf5e
font_01_sfnt_off00010814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10814 10612 bytes
SHA-256: 68ba31c4db0bcdb4eff0955c9dc73fe5fa8bd9b38677059bd238f96b47700274
font_02_sfnt_off00012043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12043 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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