Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fcb2392e48470cb…

MALICIOUS

PDF

86.0 KB Created: 2021-08-12 12:22:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 29790385b90751538bb01b332550ada8 SHA-1: 40b6e92da29c38eeffb80bf91cc6350fd9cb0179 SHA-256: 3fcb2392e48470cbcb6350b8d01e875d55508b28cdfe4521731f7978138929d6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including PDF_RANDOM_URL_LINK and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM, indicating it contains links to potentially harmful external resources. The ML classifier also assigned a high probability of maliciousness. The document body is heavily obfuscated, but the presence of numerous URLs suggests a link farm designed to redirect users to malicious sites, likely for phishing or malware delivery. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://philabc.ru/uplcv?utm_term=introduction+to+airborne+radar PDF link annotation
    • http://insidethedigitaltrend.biz/userfiles/file/dotoriwewagegulufu.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/96687316417.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f052fb4b25d---2267300198.pdfIn PDF document text
    • http://capableapp.com/uploads/files/86303593394.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/zeniragatopovepadata.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072c9d239d21---84004438125.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/74624873213.pdfIn PDF document text
    • http://juha.be/_files/file/19629257856.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/88053566097.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/jobikimuv.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160caed2c7dca3---93992509654.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/fcbd3bf0a09c24031649b1f71eff175e/powowofap.pdfIn PDF document text
    • http://geose.ru/userfiles/file/48090795370.pdfIn PDF document text
    • http://snypes.nl/img/customer//files/sifekomufitovitobakela.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/73492078629.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3a95696cf4---niwumaronofolud.pdfIn PDF document text
    • https://giasidaily.com/uploads/userfiles/file/tujotezig.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/5ba042ce97084ad6a2ae0ee2715a4be2/nezudoxuveroximurumebo.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/e034597f70b8b9d063d6a63d39b71697/38923956725.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/ehc86gmkjhqovltdu3918sess0/leduxowino.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e8f0ea95f---67301134930.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160d93bd16ebc8---23398139603.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_off0000ef95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AC 10340 bytes
SHA-256: 76fc4c79adb6c2d47c1da4fe10647bc513cb7a1fd45c6844bf86d3af2ecf01b6
font_02_sfnt_off00011f20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F20 16608 bytes
SHA-256: b9916285695120a34e842483882b50140beeac83c51a97f49cd1b5d932413521

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