Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dea222ccc270e23…

MALICIOUS

PDF

84.9 KB Created: 2021-09-06 03:11:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cece9a230ca98d9ca937cd37afd9da3a SHA-1: 337c9c3ec68e7d4f39beab41730730e45ad2d35e SHA-256: 3dea222ccc270e23ea27e30f28b78073a85d980a33ad7dfdc197f4a91c878600
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF that contains numerous links to external websites, many of which appear to be hosted on compromised WordPress installations. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with the ClamAV detection and ML classifier flagging, strongly indicates malicious intent. The embedded URLs suggest a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://huntic.ru/uplcv?utm_term=javascript+dialog+box+pdf PDF link annotation
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6deed22b17---81265802427.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/lupugi.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084e214a0777---58147027622.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/josugisidizizeditobito.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160802314aac85---27530175188.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/j8qn7mnmq932m86dv66ubms0eb/vitowov.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612db85ce934c---92434246368.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b26ac73c824---31594509040.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/52661134444.pdfIn PDF document text
    • https://piuspvc.it/userfiles/file/vepowavukenizudoli.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/20037164861.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/4d80b6f2652ae36642375e1033379044/76278911902.pdfIn PDF document text
    • http://word.mn/uploads/assets/58152044009.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/vowobodinerebe.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608200ea87e66---jidedezune.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf6e190693---39314370095.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/maxuvuliratejogata.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/fqsujk48vka7r04f7r3n4je0v3/lamubajivuku.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/2a8da200dafd3f0d7572368d23317c2d/59126666280.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160996cbc90395---wovomewotejuwupe.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3af4dd2d1---jirexig.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/wabetuk.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/warojiwoge.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/13b41773f9eddfd3ac783a80d19301b8/kaxojezulitakukidiso.pdfIn PDF document text
    • http://assistance.uz/images/shared/file/rasexezeranedomifusiw.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/lufataw.pdfIn PDF document text
    • 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_off0000e734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE734 10860 bytes
SHA-256: 0db7766574a0e7b17b33b2ef82d79a05d011df0bdf1d1c174271c4ba845a460c
font_01_sfnt_off0000fffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFC 17720 bytes
SHA-256: 09333b973750de9df4eaefbd5ec7873b1bca91132dfb46b6653c68dbfb306bff
font_02_sfnt_off00012d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1