Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e7c5671b6680ee5…

MALICIOUS

PDF

82.0 KB Created: 2021-09-04 09:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f133ea3c4b6388d0920102fa1179b7e5 SHA-1: 5a18028b1ccc99e0033d7d4646bb80b846b2f2c6 SHA-256: 4e7c5671b6680ee5f341d9ef134407d6769a56e9a5e682d34b6e185a0e5e5545
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be directing users to potentially malicious content hosted on various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/161131484859fe---51393702584.pdf In PDF document text
    • http://krugernilssonreunion.org/clients/c/c3/c301050bdfa85653d7453904791897ac/File/86514535486.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46754765485.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/xolabewodipedipo.pdfIn PDF document text
    • http://bg104558.agchost.com/userfiles/files/zulupapupulexaj.pdfIn PDF document text
    • http://telmeed.com/web/ckfinder/userfiles/files/47670292314.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ed4522ee9a6---zuxularivejetuxokobe.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/4d3d5ec585dd1f5a6475845859634d15/vuxasezobukogixipizun.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/zixexifojexifibaxa.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/datoferizakotupenara.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/78377252884.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/ul2afuu1mi3m4tpbsvjqoaca9t/69194607529.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/mopoxisaradepinifuna.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f3972f0104d---jinatomizegotoronigo.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/86422952758.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/vokuzezin.pdfIn PDF document text
    • http://seamacros.com/upload/file/10024306117.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611d22a635cd9---44122537188.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b1223c80b78---nenesivaduxut.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/nisekudidarawusi.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/pepapegun.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091aa530ebcb---gawalerujojatozisibajen.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/93267616236.pdfIn PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/16377103532.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=pdf+osteologia+animalPDF 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_off0000df3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3E 16660 bytes
SHA-256: ed4db6669c84c22b2fe379c6ee0b26f995430cb25089e364a09221be59ece33d
font_01_sfnt_off00010a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001228b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228B 10596 bytes
SHA-256: cd36fdb4634c3021ba37bc98f32ddae44c8f1b57400147a738d06d20d57f2424