Malicious PDF — malware analysis report

Static analysis result for SHA-256 61a219ddfb989fc5…

MALICIOUS

PDF

85.0 KB Created: 2021-09-06 15:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 111414946e521d81b3b8e75c850382e6 SHA-1: 0f0786536587f067586c848f41f9241fecd54700 SHA-256: 61a219ddfb989fc50c69a8183082afd2c0600581598de2e1f66850d473cdc7f6
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of multiple external URIs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://sma-dfgg.org/site/admin/file/90105483774.pdf In PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103659cdd7d9---28875527974.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/49743102019.pdfIn PDF document text
    • http://belst.by/upload/file/57415081830.pdfIn PDF document text
    • https://computerzone.pk/file/wowenovomimabovezonemepox.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/15705297260.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/c0c320b75a4828878598dae7f7fd9515/soniri.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e38c14ae9---45314341632.pdfIn PDF document text
    • https://rosanaalvarracin.com/userfiles/file/xulike.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/afeac9994b2bcd750838ab1271335b3a/55016090496.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9158ba756---76470992323.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/ottciuv66e8fkla267vfjs0s81/88805684514.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3432170f8---78280153347.pdfIn PDF document text
    • http://omg50yrs.com/clients/6/6d/6dc66c997efb3e4e8ce6e6e7d0694e91/File/96311743919.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/45988304890.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bf3df5745cb---2008760862.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/xezorivosudebegarosax.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/90412077614.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e51177ee65---noxolesazewujenoro.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba7db890b7---feguraximifi.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/wakeburolobomafidov.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610573cc2e0f9---dejimipuxezefupetemu.pdfIn PDF document text
    • https://alutat.com/data/file/ruzoleminalogalotusisarom.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/90838613197.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/potiku.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/selaze.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/161060b6b4bb74---redifogafoximeda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=navigating+pay+stub+worksheet+answersPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BC 16608 bytes
SHA-256: 92c0cc7787c4120b9f29f0bb78e0bb07783f6b2f02a2cddaf4c70a96b58583e5
font_01_sfnt_off00011465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11465 11060 bytes
SHA-256: 74b782026fb9805adc0dec5984366eddd28670328948bc7e4a271bf500f169f4
font_02_sfnt_off00012e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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