Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fac808e0171f1bc…

MALICIOUS

PDF

86.6 KB Created: 2021-07-31 09:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a44b5ef43e29c9e8fe6c0cf4d323e0c4 SHA-1: 28675a1de8a984eb8d8da6334e51c727bfa4b93b SHA-256: 4fac808e0171f1bcd5d9afb44f5249bb1abf95813cb8a34016d9baab3b0ec617
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress upload storage and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The PDF structure and embedded links point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wardwrightself.com/clients/863644/File/mafosukevif.pdf In PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/5984d24f83f8a5b68fb42d8468c0fe30/dikaludomagakejoxi.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/37040856946.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/waloxozab.pdfIn PDF document text
    • http://soflocops.org/clients/83264/File/ganom.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608436b2efbab---18118944156.pdfIn PDF document text
    • https://tl-systems.hu/files/files/47761907074.pdfIn PDF document text
    • http://wphs69.com/clients/1/13/13dd0a1135c99f886ff4006aa3c820ba/File/39515113817.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/ccdbe5dcee2af74e48c332cff3ef05dc/kodikinituzezetonedumug.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3735cff21---wadudibozadatusuvajeze.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ec2471e85---topogosigejonovutoraba.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/balomiwu.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a20bb88bf0---342473251.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/dewowifuzamiseraxajito.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/jovaxigemiso.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/35903429985.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f51c42e0f---29743014934.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/f15082ab0f7a98552eb54d25516fcf6a/49833202732.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/q91d3ni7sltq5m02a66n0dvsc1/zovevalotitudelakebuzuv.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44ef3dc425.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/31ec2f176f5414fc8a30810601f9980e/fedupefa.pdfIn PDF document text
    • http://letdentalab.com/img/files/70404172710.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/08cef57c1e2f3e1f9b9f1c37876079be/16522450458.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/g7t61jrtha967u2uj4vf83f656/23787594188.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+make+amiibo+cards+with+nfc+tagsPDF 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_off0000ed0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0C 17700 bytes
SHA-256: 6789ff9818d055ec917b5bbbf3f03ea7fb17d8fabd41d16709c6c8ec35566122
font_01_sfnt_off00011b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B01 11188 bytes
SHA-256: 92cce5fc1c773613c37ce72cde6a3785c926e4c9c25e25db458b34694d6060a4
font_02_sfnt_off000134ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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