Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a358200071755ac…

MALICIOUS

PDF

101.7 KB Created: 2021-07-20 16:41:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 344a1bbe9f0ac5dee61f537c84dd96ba SHA-1: 6a95eceaafd2b2da4c99c1adebdf9d84f5ff4210 SHA-256: 1a358200071755ac5db4c6e44b7b12631b53ba465dbfb4f7fa9598075080fb9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or scam lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious content or phishing sites. No scripts were extracted, but the structure and URL patterns are indicative of a link farm designed for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9803

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://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/3e2sd1e36evgp96k7op3qbi4fl/40491458665.pdf In PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ftvbvnl5q5l2ovkk2q4k8a6h60/sanipogibebuzov.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/zadagipafoj.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e47357ac90---navefowusowot.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210626035746.pdfIn PDF document text
    • https://ivanamihic.com//files/80856392090.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071ecda47524---29438530504.pdfIn PDF document text
    • http://flyingcarpetclementines.com/userfiles/files/boladefutezisoru.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/20544736550.pdfIn PDF document text
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/69761644677.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/48123569738.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/ktijv1if4pplc8he4p5jg5f43f/kofaxoritumigojatavej.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/bbb42c61dea1b9a8ff3a6bb496361a25/vujuwuzudefunoviruvoril.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b29564bbabd---68870392134.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/40429149967.pdfIn PDF document text
    • http://guinyardfamilyreunion.com/clients/62985/File/fusanefuniz.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/t461vpnc6n2av3qb877ul7do49/34685503644.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/c0b175b63a5dd2d29e9f7fb30e517609/levuwuvatukume.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/zifogapuxijaguxedavadiket.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/11598726895.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da6cb7c60e---xuwixuxaxafikomopuxabu.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3bd06d0940---jimidovisegekod.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/10760221230.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/6fba32dc9c0a8a254cc6d6f501dc2b4e/8398318622.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/94348a89994dfc8a9da099428a90fa8e/benopinatoremobinabudewuk.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/fo1i802s56nka093s04ttv9546/mawojisirodomat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=hotels+with+inside+pools+openPDF 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_off00012b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9C 17924 bytes
SHA-256: ea72b98a7567f19809225842b89c1cd0dc0bda89d71b7d4dc4f67083c86ebd5a
font_01_sfnt_off00015a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A37 10304 bytes
SHA-256: 5bef0b8d3fbc6edab81a23c078bfd64bce6087254ece0475fe08fd955c8695ea
font_02_sfnt_off00017159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17159 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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