Malicious PDF — malware analysis report

Static analysis result for SHA-256 16874e05de3a5c35…

MALICIOUS

PDF

59.5 KB Created: 2021-09-05 08:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d3cc8ee7884c621fd1ffa9946af494e0 SHA-1: 16c18f4712e366eb7e9f1191fc8dac328a135129 SHA-256: 16874e05de3a5c352a3895a4661f82903676b9045110c8ff2e63934a2e13e3d0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7265

Heuristics 5

  • 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
  • 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 http://huile-de-nigelle.info/userfiles/file/wofiros.pdf In PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2053956a67---83518827167.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/zeziwubonuxudowovosipi.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/mibepibavinifonojupax.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c00073ae759---17349959523.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/f176f64429ae0976b0290b52d199ce64/wepubawotuwakivopubin.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/jenumexiziruse.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1609483e083bf7---62082857959.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9cd65a038---38930130977.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/gujenodinoxifinazen.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/samip.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/30232740017.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/47602635071.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/dipalotisosebetul.pdfIn PDF document text
    • https://norservis.info/files/files/filevazikojeku.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/nereganavilusiri.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/fobibuduvora.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160f890f625847---vuvazujalik.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/89675239417.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/zisopegoruvopilokel.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088ee3c83d8f---popufolomogasimoponilil.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/94860074119.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/44272956023.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=map+of+versailles+gardens+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C6 10636 bytes
SHA-256: 0478176a0fbd75c9674f13374bb964547b25fb802e6804a4dc15581f20d2e941

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