Malicious PDF — malware analysis report

Static analysis result for SHA-256 e837e3428c99cb1d…

MALICIOUS

PDF

95.7 KB Created: 2021-07-21 20:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7335aa5a80ca2a47ce7d20142d7c9edd SHA-1: 59ef0df3b4efa141c9ef52be887a113f5bfbe2a1 SHA-256: e837e3428c99cb1d49b5b739a04a20576010f2307a861a9b53b6a8cf5759c034
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous external URLs, several of which point to compromised WordPress upload directories. This suggests a phishing or redirection scheme designed to lead users to malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://fandimnarodaku.cz/upload/file/68165845607.pdf In PDF document text
    • https://indikino.com/ckfinder/userfiles/files/45584593805.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160ac57ee9b62d---betiwiz.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/8712584052.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/gujujugawulo.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/8900d9d6a3bb74bf6a6e53a31aaade0b/levadomanokevopijeloku.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/49415715358.pdfIn PDF document text
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/jepegigobetiregajomewixet.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/kibugevobikunimupemafav.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bebd3a96056---39351957831.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c227990d76e---30179150566.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/kokejuvoj.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/edqrbq1qu0jh7qv2e6mcbteb6c/dunowikotula.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b67d6d1fe---26765802898.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f64a9c0992---73912070708.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b18eb57f77f---24511185237.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/93578924822.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/50b0aaed5c7be644050bae4a6b92030b/41463278505.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/a48e4b87fd26cb556a9cd0263f0be0cc/84665491163.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/05a11910cf8bc1c3374758e40b94e4e1/58095412275.pdfIn PDF document text
    • http://markone-tools.com/upload/files/gezejuxafazamek.pdfIn PDF document text
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/benupadu.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/ed35bf51e1ac7348cff32052161ded7f/91146484230.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d05bda22a03---nonarupat.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4015ddb9b---85345355123.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=mindfulness+based+cognitive+therapy+pdfPDF 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_off00010b34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001234b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234B 11312 bytes
SHA-256: 32dc6fbae6f30df57d98015b8c5bd8ec6cf2800fd3d65e95783307cef01b8b9a
font_02_sfnt_off00013d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D7A 19876 bytes
SHA-256: 06d1c3bb62788fda54a5d3e1ea47ce3ae48c81517cf291bad7a683e670a3fb7e