Malicious PDF — malware analysis report

Static analysis result for SHA-256 58a64e77a18558fc…

MALICIOUS

PDF

95.2 KB Created: 2021-07-25 01:08:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2d8ecf02ef9d78b37777273604297c6d SHA-1: 12408357b7e7ef72934d88f289586fa4271a0e41 SHA-256: 58a64e77a18558fc8263bd49b21b6dbcf00f7e1d3135a3ef87526de17ada7046
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and multiple links to external PDFs hosted on compromised WordPress sites, suggesting it's part of a phishing or malware distribution scheme. The presence of a download button lure further supports this, likely leading to the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/h987q111t6d38sf7jpso738g04/99461199783.pdf In PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/e50a512fee9a7e1a4b77545e8295d1dd/zinewef.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/womel.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/14691399138.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95b2a390d7---58331051373.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e4c033da4ac---sinifugetofad.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/33001872371.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160721d54aa84a---5202669563.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/233d8f039076da82ca46a18821bc17b2/33888354109.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/94011766764.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/3098fa55df5a72ba87264ed072eac866/44074114644.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/penijedexemalozij.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/25519208363.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c10b0c7260---33409155640.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/33659339280.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/d6c4cf0378fb38c1da8d3c729502d8fd/lesevaberiro.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/4kus0hc31chfo47da8t1gkv224/99837246713.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/lewovozaz.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609feedab42fd---sujemedivumuzuvi.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/11b9ed6ed958f56a5fbd9f69ff9886c6/dutekizudavesefox.pdfIn PDF document text
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/loxowuxori.pdfIn PDF document text
    • http://safarang.com/basefile/files/dubufavusobarasogatuwigo.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/33404701084.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/5361889040.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160f1a3c8ae88d---9345176232.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/hq50fd7qegiorafslt9jjq8vdk/36030711390.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=gta+5+download+for+android+apk+and+obb+ninja+gamerPDF 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_off00010e2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001263f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263F 17576 bytes
SHA-256: e2f35857f32e1981cca5bcb26792d5d7e4ef874495c766dcb87d68d51c6b052a
font_02_sfnt_off00015494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15494 11292 bytes
SHA-256: 5a18f55abbbc18085984d9da8ed9194dfb503fa2cab7e4dcf2e884da40b0a577

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