Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd1d8bf852eefee6…

MALICIOUS

PDF

86.4 KB Created: 2021-10-08 13:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7c1527e65f3c25d0152dd7f36b52bc85 SHA-1: 9b98b43dc20ee4390985523d842e6c9152bc1ec1 SHA-256: fd1d8bf852eefee6ceb06cc3d3610a667148954c61ee7cd40f2d90ed36a84215
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is unreadable, but the heuristics and URLs suggest a link farm designed to redirect users to potentially harmful content.

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 https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/161514d76884c7---vopigemumadakiloropasopon.pdf In PDF document text
    • http://ogledalata.bg/uploads/pages/files/55357427156.pdfIn PDF document text
    • http://sweet-sugar.de/images/uploadedimages/file/88770413895.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021092302511073499.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/bipoxupit.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/54575559379.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/77888845977.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/e0f9b6193ba55bea713bfd3bdaefb9e3/xogisatowopew.pdfIn PDF document text
    • http://pk.mo/userfiles/file/ruvevagapubiluzu.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/xurukupidisojer.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/zibilipizijabaduv.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/75059207874.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1633647652_faa20875b5.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/24599745644.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/36326751358.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/b26d144ee2f36d5270e859d3a146043f/mefufanobiwafana.pdfIn PDF document text
    • https://12waktu.com/contents/files/35409844716.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/robarinebiralud.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///matag.pdfIn PDF document text
    • http://www.medic-pneumolog.ro/fisiere/file/53067260288.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/12568539813.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/xusibukis.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/51792317625.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/532845777.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=acid+reflux+for+a+weekPDF 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_off0000ea64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10276 19396 bytes
SHA-256: 6745755fe7058bdfb09b6829a74bb94a33472f58a6011dd291848fdb051e9d7d
font_02_sfnt_off00013403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13403 10460 bytes
SHA-256: b71c7fc10dbbcdbd1e7e56839b5377c0269600f834e03a416d465a8b53e8f147

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