Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4820457b9d6ad3b…

MALICIOUS

PDF

103.3 KB Created: 2021-07-28 06:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1c2556f7947831f4f23482ebb024d472 SHA-1: a6b073754edc25e3c371b88599b5d5c48115b30e SHA-256: f4820457b9d6ad3bd389a62800968ea97f1984e6992675662ded8803f10b20e9
196 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 WordPress installations or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of 'LOLBin token sequence in document text' and PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' support the conclusion that this file is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/734ec62d34e6ce062a023a7acbcab653/bupevaned.pdf In PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/920d94725a605ba441a05fdbfdaabdd9/43081136003.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/wepefobewilubibakeje.pdfIn PDF document text
    • http://halaljones.com/uploads/files/noluxilugezex.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813c0e4e851---paguwazidalekapuwujigaf.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/warubegazokalataleg.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/gewujabitinobazak.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16079d8f49fe07---jazabijilinumefijawajap.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/416f470aa9d42479eddae9e9a95d264c/xowikawurotid.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/95261138602.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/fafefonofutikalum.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/93792678740.pdfIn PDF document text
    • http://groupkaishan.com/d/files/91046669093.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/65679044855.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b764a075394---77389195736.pdfIn PDF document text
    • https://madopin.com/calisma2/files/uploads/fexigulikanefubafok.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/kesozupefufukugovov.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/18053521661.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/8084636899.pdfIn PDF document text
    • http://novichiha.ru/pic/file/45171199134.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/63429124165.pdfIn PDF document text
    • http://associacaoIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+do+fonts+on+roblox+adopt+mePDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A20 10888 bytes
SHA-256: 5749d191c4aecee42470d3de281163bf9168f8c1b997c71c26844cde63df7f6a
font_01_sfnt_off00012320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12320 16220 bytes
SHA-256: cc5a1e1d9bd3c61d2ac7cc3563a55a039fec93378163103440eadff688eaf4f6
font_02_sfnt_off000138d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D0 19792 bytes
SHA-256: 20ce855f7a6e4cb84b8be45c96e97914078946b6bcd824a351471291db2bfff1
font_03_sfnt_off00016ca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off000184b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184B3 1800 bytes
SHA-256: 7d4754466189fee051628fac43b7852c9697b295a030c5678412d7aed3a7e651

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