Malicious PDF — malware analysis report

Static analysis result for SHA-256 d11837aa03abe6b8…

MALICIOUS

PDF

95.1 KB Created: 2021-06-28 00:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ad00fde44339d1bc828f8eb347975b8b SHA-1: 0ec2fc140bdd3f2e933016e4939c2685bc627889 SHA-256: d11837aa03abe6b88e54be7fd3bf2ba616c3ddd7aaed9d4c5ed8615404919bf8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The primary attack pattern observed is the use of malicious links within a PDF document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://queure.ru/uplcv?utm_term=epiglottis+suddenly+visible+in+child PDF link annotation
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608617af22898---23524183573.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/47698040753.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/5c9002ca146e4f1aadea463bf10fc6e5/nulilasuboj.pdfIn PDF document text
    • https://agatanorek.com/files/file/83198131486.pdfIn PDF document text
    • http://szwygs.com/upload/xitenadebogubuvesanoroz.pdfIn PDF document text
    • http://canvangdientu.com/images/file/58319032841.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/govazozubilisejeloja.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/88111291188.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/18cdlmr7s9lhhnbc90q96o7kgm/xivefiwer.pdfIn PDF document text
    • http://bjeclinic.com/ckfinder/userfiles/files/5199661980.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/6eb97c082b00179d38f91c6b893cc1e0/pelukogorufepimafefoza.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed27936424---fijumizaf.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160acd331efa08---62500666048.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/3147153350.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202105280313476544.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9813c6d78d---jiwirizu.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/l37gemva05kd0hep92n9tknis3/16464327013.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/qn87jnc0bknq81cqpggv2avjmk/paropoparujujabavawo.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/16743306095.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/2e3e27d7350b279fda09f4b647fc1d0e/50276772755.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/93893513663.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3c0229314---gugezinikenawo.pdfIn PDF document text
    • https://szaktel.hu/uploads/file/98725252539.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_off00010cc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC7 10932 bytes
SHA-256: 16292c5d1cd40c23f818cf3bd220c7e6daa73751c2ca013ab66b1d7c5f542b89
font_01_sfnt_off00012599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12599 18612 bytes
SHA-256: c0d0267f7e96e236ae5edbd08a83ac52a4a3291a15baa267cb79e1a8a24f5f55
font_02_sfnt_off00015700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15700 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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