Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcec8e25d7a880f3…

MALICIOUS

PDF

93.1 KB Created: 2021-09-05 10:04:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5c9bd7a224b5fbf14f8128aa523946f5 SHA-1: fc2e9c9b4e6dbf1ba36fdd3eacda8c8fc4aef5d9 SHA-256: fcec8e25d7a880f3114e0ab90c83e9856e6678e7304b636e9867f6d3d0ca416f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and the nature of the links indicate an attempt to lead users to phishing or malware-hosting pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://pistant.ru/uplcv?utm_term=activity+on+node+example+pdf PDF link annotation
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a4d83a5a9---xuzetag.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160737a5d7590a---21144550057.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/a7401de736b5172c897e7acac1565f15/namubukixeguvifanegoxe.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721bd590622---45446915150.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/d9fde5d3f5549ce21e27910ec7d3eccc/fasiwokitixuj.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/82057ff1ed2c86094efaaafe73e80ede/puxekejutowu.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/sukuzumonibuzogomud.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/rufakuzajesojurotefujewi.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160be466c2c6e5---48612023122.pdfIn PDF document text
    • http://spearsyounglegacy.com/clients/b/b2/b2c23f164518415ec8f3c1c8d0af542d/File/33586352349.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a8dfba9f76---309497313.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/gfc47hlj56c5irvmp9oeu7ogh0/46819193113.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/72362280502.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/91129913455.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/78562571291.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/5rg4bu6f3ar4rs6abou8m53tgh/12049912312.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/625459828.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/7290893251.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/ppigo0u1f6rst0a0uu6nnajst8/poworotelitepefu.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/kapodolaxomeniven.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/1afci8odfjeu55bub2rab5e7qo/jexokinilizuziwubalegiz.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/93687167601.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/6408435779.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a9684fad82f---77347827477.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_off00010617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10617 10776 bytes
SHA-256: d5ab8150f6ae5f667b94d39668ce711372b1a2cc32d1c26fcc725b79a2312e45
font_01_sfnt_off00011ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13709 18276 bytes
SHA-256: 36a7bdbd3ab045e4f68f673f299c4896411e2bf291f4fdcf8593864f7b587bd6

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