Malicious PDF — malware analysis report

Static analysis result for SHA-256 2919f40c6667c26a…

MALICIOUS

PDF

74.7 KB Created: 2021-08-01 13:15:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 66efa2f414e9b0d9943f6f4eeac5685c SHA-1: 3c4c3b070636b46dd16b582aed87cd44f2fe9b1d SHA-256: 2919f40c6667c26a9c1f6492cda7487f9bb60c102b58b6c4e9f8e7a1dc80ed94
156 Risk Score

Malware Insights

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

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, directing users to multiple potentially compromised websites hosted on disposable domains, likely for phishing or SEO poisoning. 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 0.9976

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 http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ec3faf161f9---18556960175.pdf In PDF document text
    • http://chixue.com/uploadfile/file/20210602224842.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/nasofitexeripesotavimuf.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/75192350727.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d954c29ee9f---10657492063.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085bcc43f621---famifumimepibuwotugurenod.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/75515884225.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/5347296327.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/lobov.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/495d794dce238adf5217d922705ad022/57307048039.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/47c4lq7pqm576i4j5lkrhrtlu0/23247268719.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/43479694836.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/tozajokox.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4165328d6---vetepakejokig.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4e6b2328a---mekugo.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cfdbf0b2b---99063655926.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/zubuvizapiwezavimoru.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/b2feadaeb41654a98e755a1e9fabece4/juramaxinezabemevita.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/duxet.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093baa5ef55d---wigezilag.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/74372022762.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606f63317a34a---xanosozelide.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/jivupawedumowaro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=big+ice+tower+tiny+square+hackedPDF 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_off0000c1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D1 16196 bytes
SHA-256: e658aeaacecb8c3934ec28cc1ff8d887922c13fba47346769e04620a4b924b44
font_01_sfnt_off0000eb9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9B 11196 bytes
SHA-256: 6dd262dfd0afd62ebdcdb66edbc3db1900bad0b36d7aa113458dcae5b84e378d
font_02_sfnt_off00010566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10566 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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