Malicious PDF — malware analysis report

Static analysis result for SHA-256 93f75c7e85476f98…

MALICIOUS

PDF

79.7 KB Created: 2021-09-05 20:34:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 884957b77054db94e75c11a1840654bc SHA-1: 944608b283091e448cf9ed0e2e353f018791b63c SHA-256: 93f75c7e85476f9826665cc087309c8d446861c98384293ca893c63f142b33a9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The sample is a PDF document containing numerous links, many of which point to potentially compromised websites or disposable hosting. Heuristics indicate a link farm designed to redirect users, and a critical ClamAV detection confirms its malicious nature. The ML classifier also strongly flagged this PDF as malicious, suggesting it is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.allatpatikapecs.hu/images/file/96265317947.pdf In PDF document text
    • https://suksesunited.com/contents//files/63334635730.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707a3b379d3---xawokez.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9f06862b1---gepikevutovewavodovisoso.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/1f5d8139c0a6a45b3d496d2e0418da7e/19551311997.pdfIn PDF document text
    • http://thegroverestaurantnj.com/userfiles/files/xunokuzudofagolujuz.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/74803381421.pdfIn PDF document text
    • http://lifeisartfoundation.org/sites/default/files/images/userfiles/file/lakoroxila.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/tolipiku.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/jugetezos.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/rirafijobepidunenut.pdfIn PDF document text
    • http://vektorma.ru/uploads/assets/file/jilodifasiv.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078da51d9176---konulixumokedebalifon.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/badokesepuseditavogodel.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/xafikapawevedo.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3a2270655---seleropifudebovasi.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/62935571723.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/24100748402.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/topuvexamekedatekirut.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/sutomaxevipekujebaxuzax.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/73225746245.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/zonimekimixadipa.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d872eeadad---xufuzezef.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/dudojadi.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/degirimikowinodure.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=probability+theory+questions+and+answers+pdfPDF 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_off0000d223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD223 11180 bytes
SHA-256: 78904054ebfb99116b2517c3e528757d01cf058d1c2464ccd866faddf7f7fc1b
font_01_sfnt_off0000ebdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDB 17412 bytes
SHA-256: bbd6ad058d0dcdd30b705530aa573779f12b2d8bf7392634b83a4b0988df05c3
font_02_sfnt_off0001191f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1191F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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