Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f6d4ff386cb2f7f…

MALICIOUS

PDF

91.1 KB Created: 2021-07-07 21:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 559c299ab7e56e0fea11a716de731127 SHA-1: e85ae5496a4621321dde435072c1cad430e2147e SHA-256: 3f6d4ff386cb2f7f9da66bdcb1fdac4a653eaade263bd608da711ef5cabca3fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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=prayer+for+the+body+of+christ+scripture PDF link annotation
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/b1aa8577eae61665132d38f759d7b43c/38844517039.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/78300823961.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c253534f1ec---84307168835.pdfIn PDF document text
    • http://apple888.vn/luutru/files/26257102209.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/97666513339.pdfIn PDF document text
    • https://congchung7.com/upload/file/nikugixatedavetujuwosow.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/6hdtpfuoohsku0bg25litn7tmi/sabetun.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/visefirowotoletare.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/23713228960d52c16767ad.pdfIn PDF document text
    • https://bdata.vn/upload/files/tobederopitizaxesogo.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/62ce12fdf9cc59b5ea6f28a7e4f328a5/99528168485.pdfIn PDF document text
    • http://cymagun.com/userfiles/lubija.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/sobopaja.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c748050cb---girivalofo.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/ec76176a9029c7a699ee832478692aef/guwujan.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/mubade.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/04259b2b82218911c2124ba5483ccc9a/94328422877.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/27901c51359b4ec65cdf8cd5ed7073c9/65508500403.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/fidewaseralef.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/jixitidejozakexuvewobi.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c84c489b171---jupunudereto.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8c4932979---kinibezoxenel.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/nakizi.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/51069532025.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608170ab4a85e---gorazofapenal.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_off0000ff4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4A 17064 bytes
SHA-256: 8d66dec0de6c52e8dab5b85c9e793cf310565b9cf385d9e6cca3816223dc8879
font_01_sfnt_off00012bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB0 10924 bytes
SHA-256: 3a3a59bfd93855afef8a795528a9d80ebded7ee9c3c9bd8de5eab1a939be2b94
font_02_sfnt_off000144f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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