Malicious PDF — malware analysis report

Static analysis result for SHA-256 b93aedfe69cf2050…

MALICIOUS

PDF

117.6 KB Created: 2021-08-12 11:24:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f2b3aa4d7a07df32021fadd0b4d0a1f2 SHA-1: 5474b3b6ad2f34709c0bd3013996f345cf2eea23 SHA-256: b93aedfe69cf205072323c8f7ea358f9460b578c5faa25ddb0bca8e2cb755cd0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lapalettedesarts.fr/gestion/file/5865728278.pdf In PDF document text
    • http://www.serenissimaservizi.com//files/80399739972.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b0d246a85---65161030775.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094d4631e8e4---kutagilikuxivokemisopov.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/38572130323.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c36bed1ce30---nudotodusovef.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/namogixaz.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607297a54a518---92836319349.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/xerid.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/30748691005.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/bawekonuzologojanikak.pdfIn PDF document text
    • http://webinside.pl/userfiles/file/riguxasisufuwo.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/19596853570.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/2311424531.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/74778460462.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/79487277600.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/dafab.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/76484231039.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/ee7c515a2cd6ae3c6b93cfa839a89a2e/dakukobenanavem.pdfIn PDF document text
    • http://umiyawoodworks.com/fckdb/userfiles/file/duwixajisatifigezabomawe.pdfIn PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/jojebanojag.pdfIn PDF document text
    • http://dlikefulproductions.com/clients/875850/File/94913690092.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/darimitekimev.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/80713047002.pdfIn PDF document text
    • http://czechnews.cz/userfiles/files/54725055122.pdfIn PDF document text
    • http://tauzetaques.com/clients/1/1b/1b95303171b4519794d6fee637ef680e/File/96580766865.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=napa+battery+charger+90620+manualPDF 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_off0001658b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1658B 11348 bytes
SHA-256: cf90c9e551458f674b67e930e8f57650e57bc5b54760f884409188bbdb322427
font_01_sfnt_off00017fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FEA 19352 bytes
SHA-256: 68b0dda410bedf29837183a97ba55c895f181b782a267a439266e15a25989681
font_02_sfnt_off0001b008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B008 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1