Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c38140dbacc5341…

MALICIOUS

PDF

78.6 KB Created: 2021-07-01 20:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bd3c2a3f58412e210ab5ce81d8d68089 SHA-1: 4628cc92bd5bf20ec50462954a8311c4adab8935 SHA-256: 2c38140dbacc53416471b5bd09d264853d98368254b6453d7143387ed8336186
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be acting as a link farm, likely to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16096d3a70aa2c---pepiguxik.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7804dab9f4---xageligama.pdf
    • http://www.urbanwaterways.info/files/97599981734.pdf
    • http://hrjok.com/uploadfile/file/lifij.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072e8d2b571f---sezuxeriwe.pdf
    • http://shreejians.com/userfiles/file/bulekolaji.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b1cbc253002---lubux.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/3f13243f06c1bf5fde261a3f1eae2aa7/59365692560.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a0706ae72aa3d524ddc0b289bb5d0fbc/sotoduximedazowivof.pdf
    • http://fiumevivo.it/userfiles/files/kugusoposov.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/a103ppkg12grc7g33mmmtam277/74422526526.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/tqjg1ru4envddkfsm2ooneakr5/93678658083.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b7172d8db---37372950183.pdf
    • http://stlnsk.ru/uploads/file/28520939379.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/d6b104a6232051b6f3937cc9d83dba5d/9527396295.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a55e66fb04---letubafelupupibutu.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb90b48a77b---nelaxalid.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca5209ba6c---lewetikudukikavefulomaxi.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c1e3a610f---64144660912.pdf
    • https://jiu-hang.com/upfiles/editor/files/labusizike.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/r8i7igrv3uup4atkn57d7bbqj4/14035766406.pdf
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/luzafitigu.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16096f9cc43779---sixamadejemitujoputir.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=blue+water+point+marina
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d054.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD054 16792 bytes
font_01_sfnt_off0000e866.bin
1875ed6c24d5eaa361b1243a31850b95c67e4afbb90fda68625ca25765577b55
pdf-font-stream PDF embedded font (sfnt) at offset 0xE866 17120 bytes
font_02_sfnt_off00011577.bin
e93b5ef6dffbc11fea9d7e3cb0d48701dc7aa3641815c642ada708942efa44ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x11577 10484 bytes