Malicious PDF — malware analysis report

Static analysis result for SHA-256 4db7837b5012668c…

MALICIOUS

PDF

80.0 KB Created: 2021-07-14 01:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8fa7e1682d669e9357af81d7d39b6094 SHA-1: 6414e534a81e3b8adc94fe6e6de99e1e6d572d47 SHA-256: 4db7837b5012668c61e9254ff1664a48d1c1045b30d70b7912f5ea55beb8dac7
196 Risk Score

Malware Insights

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

The PDF document employs a social engineering tactic by luring the user to install a browser extension or update, a common method for distributing malware or stealing credentials. The presence of numerous external URIs, many pointing to compromised CMS uploads and disposable hosting, further supports a malicious intent. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly indicate malicious content, likely exploiting PDF vulnerabilities to execute further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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=spring+in+action+pdf+download+free PDF link annotation
    • http://studioambienteterritorio.it/userfiles/files/5207162854.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606e303c88d90---37940661890.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087629876044---roduzogorewiwemezuzar.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607940908dc54---dasuga.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/1cd620966382527eb49b4cd2c7b0a7fb/ravoda.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f12226f0a6---tefake.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a7176192e7e---libalopevavepakozugovut.pdfIn PDF document text
    • https://webmenuplus.com/images/file/84064634475.pdfIn PDF document text
    • https://activepymes.com/pub/file/ketemeru.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/229917f7366c3e68c16d61727b324c30/47185940818.pdfIn PDF document text
    • https://thinkhigh-tech.com/d/files/16444944993.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784ed39a73d---mogarerexasirojivuwoseka.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/rapokevotijegasojazas.pdfIn PDF document text
    • http://ruihuitax.com/files/file/90397108746.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/97563904726.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16086eb984db45---93267052402.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/fodevo.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eaa9661802---55167188218.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/90614905782.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e53f72931a5---49636321539.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/20216291835576342.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/vigelisesin.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/24566722067.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160972276adc09---zodejanixesivoxe.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_off0000d49d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49D 10788 bytes
SHA-256: 84326dec015ff3bfc727f6a95e0585fcf8883fbf3d342440b5404ac62d19f7ce
font_01_sfnt_off0000ed78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001058a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058A 16672 bytes
SHA-256: 48cfbea49a98df17cf1e21b579671f06050c53963902aadd00d44d06b1c0acca

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