Malicious PDF — malware analysis report

Static analysis result for SHA-256 d04b28556a416d17…

MALICIOUS

PDF

80.4 KB Created: 2021-09-07 00:35:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ec81ce582e2b667044dfe6574f092f89 SHA-1: 18365df3ece9cb6a78b8c076733ebe652f353068 SHA-256: d04b28556a416d179d0cd9344f46bf39349c80494af5725722c8adc18eb077ae
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves exploiting users through these links, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://uticachemical.com/files/upload/files/17180231137.pdf In PDF document text
    • https://nnkcreations.com/userfiles/file/repafuloxanawogegupexafi.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab43a10357c---82544916739.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/0196eec836e4c409ff9b92a23a757336/latiduvafisekiposimada.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/78d3e7973208f8d6423fd34fc2ee45fd/titego.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/050327482714.pdfIn PDF document text
    • http://cityfate.com/files/files/10673687748.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/mosepugekorevuxipabek.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/53375050689.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/burev.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/seliriwugosisesuniluvep.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b233f9b1de1---bewunomolanivaz.pdfIn PDF document text
    • https://castel.ro/userfiles/file/92366211550.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/wunitukunanano.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/jijeva.pdfIn PDF document text
    • http://contua.org/userfiles/file/nirizig.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/kqo7m9bckhfbt65hmf51ail6hu/57462936193.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/9crqkvk2kks6od9ein07r9t379/janiko.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/74882041708.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/dbb563953e8d34ee2a301feab13a1fd1/kibodejasuxa.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/gatawevorotumosogew.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/0638ed99ce25fd4906fc0b641a9656c8/33743902126.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/vuzusobijobesan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=optimization+techniques+nptel+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_off0000d68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA3 11116 bytes
SHA-256: 2361466600ba34da3c131d2f4ecf5e784fea4785a230d12c0be00580c5cee459
font_02_sfnt_off00010837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10837 16828 bytes
SHA-256: 246a4158d6c8fa92260ee36bbf4caf6ae5d9941e4275fa6284d3526cda3b4256

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