Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d586d8b9cc022df…

MALICIOUS

PDF

145.8 KB Created: 2021-07-06 03:42:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4233d26a8f5ac5d22ae29ff11aab4406 SHA-1: 9ab83cb496d6051abeba4b5d1ffe86c690f118d4 SHA-256: 9d586d8b9cc022dfbb8a710365144955d4e7a1aa6426064774cebceaa491b7e3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan distribution attempt. The document contains numerous external links, many hosted on compromised WordPress sites, suggesting it functions as a link farm to redirect users to malicious content. The presence of urgency lures further supports the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9742

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://laborke.ru/uplcv?utm_term=agreement+of+purchase+and+sale+ontario+fillable PDF link annotation
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/39212bcde603817325324d96661d8bb1/vokadezu.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/82516285636.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/7ca129f6616f6cf2cbd96e4099d1a6a3/12021785707.pdfIn PDF document text
    • https://medtek.vn/storage/file/67126494791.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/cd78e9389f4024eba0a437314c7e25eb/27808307145.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/77747543069.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/0c82b8b96999cc250393565a1d7b6c62/gegizipugi.pdfIn PDF document text
    • https://ka-base.no/images_content/file/29598475983.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bb4a0261e---jojeminibenajo.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/1024af4bc97a40715d5c411f2e265f38/devivusejuxab.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/13331313609.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/cef0fe28de32453250564e50de23c915/nabaxubejapisoxote.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607afb3e9b5ae---64096581478.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076919a62534---10607077148.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c28fa556cdd---dubapoxufuluwodazaxofaxid.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/76347787622.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/pemalomelibonuruvuraxesar.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df93eba80c---78945971755.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/zovekatadikoralitefizok.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/35575169773.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/dujulujukufiboxigise.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/55994516012.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16083e91699ca9---4028639465.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/89981604828.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4737dd576c---3944679551.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079404b4d451---31802287765.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/21002220731.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_off0001d7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D7C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001efd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EFD7 17980 bytes
SHA-256: e65114f283e0679022d765fc5c9d260eb9c16b1c21a3a73872f8a16e3cff98ab
font_02_sfnt_off00021ec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21EC9 11288 bytes
SHA-256: 6a531594ade01caff4305f5ec20427f8a4b623e9a48b978e6974f6dbb4c8c788

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