Malicious PDF — malware analysis report

Static analysis result for SHA-256 04e1074afa631476…

MALICIOUS

PDF

95.8 KB Created: 2021-09-05 07:25:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0c8e52d7d03e21d4e74a0b6e8314ea67 SHA-1: b86b58f4a920b2829193a432aeb6f86cf010ead7 SHA-256: 04e1074afa63147682b4bf291baf6647482ce53f8999d3858491ad23c0a558f4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating a strong intent to redirect users to potentially malicious websites. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's part of a phishing or malware distribution campaign, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=gmat+preparation+books+pdf+free+download PDF link annotation
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16102e26bf3905---pinitubopig.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160dcab4cb9b31---medovuzimirefasowe.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/zavubokutazuxupa.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/namasobitiranitas.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/gujis.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607867bd6f416---miwutovutunaxim.pdfIn PDF document text
    • http://takeacode.eu/user/d41d8cd98f00b204e9800998ecf8427e/file/57570830423.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/32334379344.pdfIn PDF document text
    • http://placc.info/up_image/55794688792.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608648421241d---61006540405.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-1/20210501103201987296.pdfIn PDF document text
    • http://effekt-film.de/files/file/penubepimos.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/85266914211.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/67234833262.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/duwelusidaxuzenu.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/vewet.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c57802d5d17---12333379399.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/94857285050.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/80372176263.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/e5c7c44e5d9e92bdc84a26e2e99027ba/12856189078.pdfIn PDF document text
    • http://iccarrentals.com/files/file/21299360284.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/xukakidimak.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/31822301261.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_off00010bbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000123d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D3 11016 bytes
SHA-256: e7c1bbefa4ce23ed9786185ab1219ea364b650c9bb1139d269918422d27d1760
font_02_sfnt_off00013d42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D42 19664 bytes
SHA-256: 4a41be0168eb41c008c9cf8d6e132056e432431241d1adad9397e3ac40d959c8

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