Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e4becf1f6022791…

MALICIOUS

PDF

85.5 KB Created: 2021-08-17 15:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dff50e667fee5bf75a0b21c610eddfde SHA-1: 08d58cf86e2f8533353a6f1253c8373ef8fc4577 SHA-256: 3e4becf1f60227910040fc70c71ad4151f73e8f40e00ff06d03363c62f59db1a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

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 https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/9554544b075f113396e7c35e9d288639/88326355993.pdf In PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/091gt2i8jlqagg8salgijat223/96826185977.pdfIn PDF document text
    • https://sapporopools.com/contents//files/98836787699.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/xuputalatuvaxa.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/85282598124.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/68705558453.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/79214843108.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/vomodotaxotivogafewamobi.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/65343071397.pdfIn PDF document text
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/xamadiwexowobawesewuto.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160937e7cce7f4---69218214821.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081555c657cc---badun.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/wevufawogujivaxifawa.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/vulakit.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/xajevuberufotiraxabok.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/5830714302.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808ce4b75e5---24761133859.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/73f5773a7eb4038aaacafb877ce59e6a/pepunujowebikanizavudu.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/tebupudifatof.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/24347211071.pdfIn PDF document text
    • http://mextro.de/upload/files/16096401800.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/39785334735.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607f786171778---dovuzakegodudofu.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/55873781727.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=nombre+de+las+placas+tectonicas+del+mundo+y+su+ubicacionPDF 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_off0000e1f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F6 19428 bytes
SHA-256: c85cb06253101664b11e37e3fe9a24e594c54eb64ef29ac2e66326e83a9c515a
font_01_sfnt_off00011487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11487 11004 bytes
SHA-256: b668826ce83cbdab41cea075260aa204bc680883287938885942f8c3f0639947
font_02_sfnt_off00012de8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1