Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffdaf9203e28f60d…

MALICIOUS

PDF

71.5 KB Created: 2021-06-23 16:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 5568e26a6f4c243b162d54d0eeb7ae15 SHA-1: 594ee84ed2427e74928d11075d53c051be3e3d85 SHA-256: ffdaf9203e28f60d3760314f189b5e6d4d90964f5de240aa4a9c0b16d665aaf7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, which host other PDF files. This pattern suggests a link farm designed to redirect users to malicious content, likely for phishing or malware delivery. The ClamAV detection and ML classifier strongly indicate malicious intent, aligning with the observed link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://qualitymattressfactory.com/admin/userfiles/file/30341688449.pdf In PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606c7be2886fb---67614918254.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713b48b0d13---85670478535.pdfIn PDF document text
    • http://jp-photo.cz/soubory/files/26187893669.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/20100040501.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd379bbc2c---lesed.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/kiwivisovalubemone.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/difozimetunesogojozijaz.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b40f072ed9b---dafelisuxebavo.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/zasetananum.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/4b70fe2a82c9af55d67edafdb070d240/40268249328.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c2cd793a9---84599452722.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3dbc55ed9---93488651805.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/a79f5afd9c3aa2af29d716377277ee86/fudosidojovaxedabo.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/50880484631.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608d0480bd613---dekinikirodutojexejonudar.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/benirowatizuxepotarofulip.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/48hlj92o5sbl557fofoiksncjg/jiriziwit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=iso+16852+pdf+downloadPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC306 3076 bytes
SHA-256: 087822bddd444de04983d4fd29f20e0e8d17105c999294dcb8007477946b893a
font_01_sfnt_off0000cdfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFA 5624 bytes
SHA-256: a10bc33eff29f6e0efc3119a435c22cc1c62a7a92e3a57e086b398ecf677da9e
font_02_sfnt_off0000e14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14A 14920 bytes
SHA-256: f1f49c6ae5cdef2e9111a25ea9071bc568a840bbc932ea99029990666b48a6a5