Malicious PDF — malware analysis report

Static analysis result for SHA-256 93f65f5f9f93022f…

MALICIOUS

PDF

71.2 KB Created: 2021-09-22 17:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5bea8704e5f03a5109aae3d8a66e161e SHA-1: e54aebbc5720b09e5b014d5b423d2345d793449f SHA-256: 93f65f5f9f93022f8323666c995e2f6abee8b34ffcda79da5661d51dd107ef77
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. The document contains a large number of embedded links, many pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URIs and random URL links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://infosantiere.ro/userfiles/file/lajofumujugi.pdf In PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/4d403da1d84e03a91bea864f3dbdb264/wosalose.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143dcfb1796d---damazoverutinozafalij.pdfIn PDF document text
    • https://lideregitimpaketleri.com/calisma2/files/uploads/relijagozoxukoxoguku.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/naxajifa.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/v0urf6u1o1vc9mt4066tml97qf/10658049481.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/beguxowotigovafopekanojox.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/sefivo.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/85386173172.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/zibowazuduv.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/91990815888.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/6p4lfe66isf188653l33mkob66/13956701701.pdfIn PDF document text
    • http://bscartridge.com/pic/nemisamefalixara.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/fasoxixedabaxezamusezol.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/kibowupezeb.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/mimarida.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/jolawirebodezomuvenorak.pdfIn PDF document text
    • http://pronobile.de/catalog/file/20044480328.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/fiwumevawiv.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/jefadabupoteronikug.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/vuzigabukadukalimejikuwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=introduction+to+genetic+analysis+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_off0000b471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB471 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC88 10960 bytes
SHA-256: 6cead163fc52ece8504ceba7e565c021cab8dd90921bda3212514201a3202a8a
font_02_sfnt_off0000e5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E5 16096 bytes
SHA-256: 3e34216b6d5d10f9b6eaade1ac21cdf0a9e314d3f90c8a73a2bd4ce5ac41b9ee

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