Malicious PDF — malware analysis report

Static analysis result for SHA-256 442c09294e1a7a55…

MALICIOUS

PDF

117.4 KB Created: 2021-07-08 16:42:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: d9219b854a0d0fdc7082d63d0e3ccafa SHA-1: 4a4593e3bb074d18b63f1e1c2f8305685b6345b1 SHA-256: 442c09294e1a7a55b349effbd937db5fc75bfbab68fa9f34f9b5995dd61c97d1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the presence of 'LOLBin token sequence' and PDF-specific heuristics points towards exploitation or redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9883

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://nomylo.ru/uplcv?utm_term=that+time+i+got+reincarnated+as+a+slime+season+1+episode+list PDF link annotation
    • https://wendi101.com/userfiles/file/pedumurozan.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160706283662a0---papil.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/57c43f10190f3f2ef9d8daae3f906367/zodonefefokiforexipozepos.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16089d42a23403---95472785772.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/lugasikufilefavatigibonod.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/56013135712.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160904ab5d994f---gesejotuvutipe.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/77ek8k4lpbfe4dlncmd1kehv1s/makubilarana.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/61488240055.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cad53955cc---nizagesoxerepajujux.pdfIn macro / runtime command snippet
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/938d54fdab2cba310b7656d2fd32fe10/ragaramisezopakajanexiv.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c873814203c---kegimawetomakewexatasokul.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/13876505238.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607616b5d40b5---90346820676.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4148730b0d---56339636052.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/g258t7sijp0sjul3hto06i2rnu/remakiku.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/53657795224.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/66018417084.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/pofekomilepenux.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce3c2e3620---24104281880.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607682804c9b5---25639032387.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb5910c797---midutinanozupizagadenesif.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/9987ac66fb68c2bd3bfa82a8aa40e117/surebidibopasufuwix.pdfIn PDF document text
    • http://jrmhandling.nl/upload/filIn macro / runtime command snippet
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDC 10976 bytes
SHA-256: 7967500a176483085d1d8c623a36d01b24832f6565632e1d16e4694cd49ab9b1
font_01_sfnt_off000117f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F3 37024 bytes
SHA-256: 94eca1db2e7a942c5c616762edb4acca5906d1a5da80b4c529bd30ca85ec6cd5
font_02_sfnt_off00017faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000197c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x197C1 18220 bytes
SHA-256: 3a5b8c8c8290f9f6707d63f0951fff27964e94f88e25aad0522ecfa2540b32c4

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