Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee21cdb8e1b0306f…

MALICIOUS

PDF

138.0 KB Created: 2021-06-10 10:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 1267411615b76ee871c60ecb45c954ae SHA-1: 0d2ca31c92644f08fc555751a0fdaba4f21de25f SHA-256: ee21cdb8e1b0306f52de2fe90ebd7b032f83d6ff8e9c8bb9b828abe93b7e060c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, likely intended to distribute malware or facilitate phishing attacks. The presence of external URIs and link farm heuristics strongly suggests this document is part of a larger malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://catamma.ru/uplcv?utm_term=arthashastra+pdf+in+kannada+free+download PDF link annotation
    • https://kurishupally.org/userfiles/file/1221747877.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608211f31c66f---1016437718.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71d37b15ff---mupit.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210530/2105300806593733633fg247e8g7s6.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/3603503c24e2899b268b91375ab4e571/26594827183.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/ribobelubuvatawu.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607488317cb20---69085641775.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160725a4a87fcf---8646496075.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/qs4kutbd4s0rgdejulhomiuvc6/juvesofusujizevarokemiba.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/40cd12d558642866286eb8ef348c2f4e/fugofapusulej.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/fd1be81f9518a63f3f6272c1fc5bf887/38596566693.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/23102b1b39009439bedfc36a9b4c5b9a/35331106764.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079f4d891276---25577831378.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/sglonun5h1s7hhs1iifajuhvbu/vanilolirataderoz.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/ea40120d93d647241af6871b00680beb/nululebugizuxajotixetim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ba1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA1F 5276 bytes
SHA-256: fd2d5a1e0b5808e35a51b8d4aabc96ef0ca5518ecd4d3aafb6c8df3bb63e2096
font_01_sfnt_off0001cc17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC17 3772 bytes
SHA-256: 9389eabb5da0f7ff5893e499ff791b47d46466a46589dcf6e6727fbd9e34bd63
font_02_sfnt_off0001d7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D7BD 13024 bytes
SHA-256: 1dc2720b719f34cfc86272a941377a8aa66fc0cdaebc0a82a5b775c414a5f97f
font_03_sfnt_off000200f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x200F0 7028 bytes
SHA-256: 5e1f79447c95f5ec5dc532fff804b5691f3b84f33b06fb48802a6d8eeda026af

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