Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d5feeff95bb73be…

MALICIOUS

PDF

91.0 KB Created: 2021-09-18 16:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 49de3f7e18785e0edd5470aea5984074 SHA-1: 5487430880ee6918cd1effde4967c734598fffd7 SHA-256: 1d5feeff95bb73be3fbb3e31d2f12eda21430b55b518dc5af59ac2a9d9478c95
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic confirm the document's purpose is to direct users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://coolinterier.sk/upload/files/wedizitoxuxekisosiputube.pdf In PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/fowapipiritexonerupilo.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161406dab71db9---57548077250.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613304f6f0b97---pakifusubivokupetezema.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/satubawupoko.pdfIn PDF document text
    • https://buka.ru/sadm_files/falojiwasulujiti.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/46026499996.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/38544288682.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/11842853437.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/88258759502.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/wediwumojixuf.pdfIn PDF document text
    • http://kahasat.cz/data/file/dolagewumilegi.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/33750234068.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/161341adbf1a1b---vugodafejide.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/vazazapop.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/lugiwexavebowes.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/87426367441.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/wojuragibozatupe.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1613df14363a45---16172934341.pdfIn PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/xunawadokusisidu.pdfIn PDF document text
    • http://vidol.eu/userfiles/file/fukebuxegoriwogati.pdfIn PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/watuduvumotobene.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/gexunabifolinezuzam.pdfIn PDF document text
    • https://natanashoes.com/kingkong/userfiles/files/68363525482.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=aladdin+full+movie+2019+will+smithPDF 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_off0000fb09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB09 18848 bytes
SHA-256: f5be7bb3881057a9ab6498284c8553af10bc9ee24a1a6bdf323a5eb47bc4ee0c
font_01_sfnt_off00012b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000143ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143AB 11216 bytes
SHA-256: 2914c8186cf0c87641c383009e13fb88ee262536311a6d979f4067cc915caa52