Malicious PDF — malware analysis report

Static analysis result for SHA-256 84f7e01ac1e1f0c2…

MALICIOUS

PDF

75.1 KB Created: 2021-09-02 15:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 38018294df71402af16a80869d5f680a SHA-1: 20542a0235320f80845d8b36ae430eff5492d17f SHA-256: 84f7e01ac1e1f0c2d4cb7c4650a0c5136cc8b7eccafefcee2b328994a81ddaa9
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It contains numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a clear intent to host and distribute links to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://allytemp.ru/uplcv?utm_term=broadway+piano+sheet+music+pdf PDF link annotation
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/a8b56c323048facd058174db3041d169/dopazini.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/23ea35ee17119ccdc2d98e9cc864fe2c/nomatokozela.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1b884d248---pepemapepamo.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-4-29/20210429005158876475.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/gakexigax.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/83543867373.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/jenelekemaderejir.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5c39051ed3---finabilisujifenupogegupif.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e4ac4f919---maxemapavobaxurigofux.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/60660542676.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/xadovusozakutoredudafin.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b11b3d00d47---gupenonolanazerewi.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b12cadef8bd---42688434484.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161218882e6721---96789412078.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161110e6e9e7da---lunixab.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/powupolasojez.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/5db30d91e720c8392058933a23ddb818/38634200119.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078cb1e3e1dc---tovotewe.pdfIn PDF document text
    • https://betibg.eu/webroot/img/files/nelunoxibumazonobiwalit.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/c6t5bpippo253c4t35dkrsg398/pivilajoga.pdfIn PDF document text
    • https://tes-sys.com/uploads/ckfinder/files/20210719/16266759756390.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_off0000c0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0B0 11192 bytes
SHA-256: 3883a2d862a3f1e1177495b73f1d50313781cc4e2922a4bbc617e3223f2c6009
font_01_sfnt_off0000dac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC8 17156 bytes
SHA-256: ae557e6ac9a8c5c8d40a2ee294f249a4fc69520212579e7777816c45fcac0bc0
font_02_sfnt_off000106bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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