Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1ac24d38315b235…

MALICIOUS

PDF

76.6 KB Created: 2021-09-05 08:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 40bfcdd8b003ad2e927265b0fbc21780 SHA-1: 44df56b2f1a83762609ab272e0d4ca787227f613 SHA-256: f1ac24d38315b235dc6442c2e2336b3d2b12a0c56207fa72ab740e4dc4e42055
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates an attempt to direct users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 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://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_off0000c6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C6 10636 bytes
SHA-256: 0478176a0fbd75c9674f13374bb964547b25fb802e6804a4dc15581f20d2e941
font_01_sfnt_off0000df05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF717 17452 bytes
SHA-256: 7f0377d4b8bdadd2004efbe8e2b047f91fd55d5318fc01e0d07642e18618b594

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