Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc2e8eceac40e0b4…

MALICIOUS

PDF

83.3 KB Created: 2021-09-21 03:27:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 853e61c35cc3bc66620f1ed8af35ecee SHA-1: 4abe4fa4698782726434ee79cd3d373b53c534f2 SHA-256: dc2e8eceac40e0b414a5393f7d19018b8c6f8d0398a63d29fa73e018a26cd63d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external URIs and points to compromised CMS upload storage, suggesting it's designed to redirect users to potentially malicious content. The presence of embedded URLs further supports this attack pattern.

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://drafthe.ru/uplcv?utm_term=pulse+sms+app PDF link annotation
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pukerefa.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/kasifanizosokejofitokoba.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/xoveboxuwowa.pdfIn PDF document text
    • http://storemisr.com/uploads/files/61429714297.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/najipilosexagawozuz.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/75176910306.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/74141226360.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/48680784378.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/mujivegijonipagagap.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139431909de2---72680351345.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/2021913222239735.pdfIn PDF document text
    • http://mdtrend.hu/files/file/zavuw.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/nununubug.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/menajasamefozopodunuxo.pdfIn PDF document text
    • https://hse.tw/upload/file/jamovoranavidaseba.pdfIn PDF document text
    • http://autovoda.ru/upload/files/35670547655.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/fomikilifejawifu.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/kulixuzubomusive.pdfIn PDF document text
    • https://durimawar.com/contents/files/timovejex.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/xudogesakofusabufoxumap.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/xirexomumidawisemaz.pdfIn PDF document text
    • https://rumputhijau.com/contents/files/19255356696.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3eb27bf94---salunufinuxuverig.pdfIn PDF document text
    • https://ecoledesgourmets.com/userfiles/file/wapekedetumonuludexa.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/49qiq4mnb2ia96obp7dlt2att1/todez.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_off0000e22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22A 18212 bytes
SHA-256: 0d2130b70ac726a9a5989e7d8c7a82b6ff34c49c0b8c24f8bded28341bedf6ea
font_01_sfnt_off0001118f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118F 10000 bytes
SHA-256: 8c06b30a3f25de05d31be49b3a7e9ea2434a414164461de8e4bab4021b2ebfbb
font_02_sfnt_off000127cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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