Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e900762a113c599…

MALICIOUS

PDF

88.7 KB Created: 2021-09-02 10:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d84d9714a43f7d172b266e202b13b982 SHA-1: 2684513257d4882867fd84a8598cf3163433d21b SHA-256: 5e900762a113c59933780dd1102655bfc7ee7b277b63c4bff2fb023498afcdfe
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting. The primary goal appears to be redirecting users to external, potentially harmful content, rather than delivering a direct payload within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://network-italia.it/file/mebigeronifikegujaje.pdf In PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/6e3un0qpe6k4i56hh9c35ki87d/tawowokufukurumeti.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160a3cc1eb3d4f---78847216534.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/cbdce4cae9e97c7aa1a80762635946ae/48529974106.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c629760e783---silixegazik.pdfIn PDF document text
    • https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/51045042680.pdfIn PDF document text
    • https://daks-96.com/f/uploads/files/41297501892.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbfce3890c---faxojugepikibanurez.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/81931154115.pdfIn PDF document text
    • https://www.dgaspcsm.ro/ckfinder/userfiles/files/6189284188.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/guwewuxigilefomexugajiz.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1d8f80a79---32856742033.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161194bcf3d54b---16494645404.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdea89e67a---53666949383.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb5ef66e89---43175851379.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/73429461465.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/4f3b903c3ba7269218b99dad36a80f38/37545428200.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/datebibexubodosatugagega.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/48232730040.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/57988222753.pdfIn PDF document text
    • http://derma-dts.de/files/file/xexoxepaxetifobobudap.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/5h7cnh37ndlsne057o41f6cee5/kijata.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/781e2695db93b2b7e37ef39a6d2c3cf5/zomefaxudikoxezozenenuxed.pdfIn PDF document text
    • http://keitbg.com/images/files/muberaxoroxepawomokis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=examples+of+non+probability+sampling+methodsPDF 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_off0000f323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF323 17972 bytes
SHA-256: 16ff34d59a66964c30254dfd51d2cab2986807b5ea019ba84c4408755199eba1
font_01_sfnt_off0001217a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217A 11284 bytes
SHA-256: fcd4b0e925b3d7198e8da2bfa30078ef2fb6547b6bbba6d03936dd1690639925
font_02_sfnt_off00013b5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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