Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b9e2577aec7c1cb…

MALICIOUS

PDF

89.0 KB Created: 2021-07-17 14:12:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: dc60d99e1e6d18e8135ef84c959d88d7 SHA-1: 49cc61ab98febdb4df6db9a8b0bb8dd0d9d9d1c9 SHA-256: 5b9e2577aec7c1cb37b7e4d3d501424250110e9ff152be28dd409cda11b18851
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160960542ee08f---13893087526.pdf In PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077f236b146b---gegolefudanej.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160afe9fae29e5---gigujarogidasefol.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/pga6eesv6dc1lnju7ld974jjva/wezarup.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/cq9h2mhjusscu9tmn9bfefv6h1/bemimesazutomovoji.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609276b247d85---begorilasoxitotifozop.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/fegetifiw.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/4802e118e31bf021f6d93609c1b37dfe/32997037474.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b8374808b---sivililurafex.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16092fe8fb93fc---92928652792.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607597be156cf---nevosiniwowupozenaxu.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772fcedb21d---97750567626.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/j09b3sb0rctomlge5bpbg1jce1/34693030684.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/sumanuvepubigutege.pdfIn PDF document text
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/60591369877.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/37642872138.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/49711600519.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941e4b09cbe---62165081022.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/zamoli.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/93712248400.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802895f1f65---82256934563.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f8fb6bf4d---tutupor.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089cb634ac4c---liwupitowotizotamewunitil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=shaky+all+the+timePDF link annotation
    • https://rt9.rspo.org/ckfinder/userfiles/files/purip.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_off0000f98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98A 10164 bytes
SHA-256: aacfb5a79846b2304f5e487748678d3c9a25163e5679ab4ab525d7295d7583b2
font_01_sfnt_off0001104f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104F 17720 bytes
SHA-256: ff080c0cfd4e24add2d3ca4dbeeb66909f0855d4e08cef1589ff415a62e7a29b
font_02_sfnt_off00013d9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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