Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d837c1901b2fe4e…

MALICIOUS

PDF

71.9 KB Created: 2021-10-07 15:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 31abb71e9628f2b2349b0ee37c1cab22 SHA-1: 971099a0b4b2deed7f3034a2ee31a6855ab1872c SHA-256: 0d837c1901b2fe4e92ed0b2b8941cfdae8caa7c144f42f409bba064c15faeb7e
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on potentially compromised or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. No scripts were extracted, but the structure and embedded URLs point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drzwiukryte.pl/userfiles/file/rewaluridetulujasarepe.pdf
    • https://powermailer.in/userfiles/file/nabutatalaxepediduri.pdf
    • http://www.cddfct.com/up_files/file/77324028427.pdf
    • https://marblobaths.com/app/webroot/img/files/61937500530.pdf
    • http://fqcycpa.com/jingkelun/userfiles/files/20210912004812.pdf
    • https://unibel.pl/pliki/upload/file/mepesuxiniwazad.pdf
    • http://mhzsolutionz.com/userfiles/file/mobom.pdf
    • https://umiyawoodworks.com/fckdb/userfiles/file/naxudivu.pdf
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/daveluzemebuxokifelifeg.pdf
    • http://energywork.pl/userfiles/file/88097985610.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb926e108d---milowevotobalulapabazugof.pdf
    • http://falconltd.pl/cache/file/15380461845.pdf
    • http://askaudit.ru/price/foxenapo.pdf
    • http://ulv-fogger.es/d/files/tuzudidasivifo.pdf
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/61215001819.pdf
    • https://journalofcritique.com/ckdosyalari/upload/files/34926999297.pdf
    • https://nhatthiengroup.com/files/uploaded/files/36246486772.pdf
    • http://www.derbysignandgraphics.com/uploads/file/23527767710.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16156fa84f0a27---poxasudepajokevek.pdf
    • http://associazionemillesogni.it/userfiles/files/fivapobikuki.pdf
    • http://www.juthamasclinic.com/upload/finder/files/xabiwosixafabaxekojeno.pdf
    • http://chrisdepanneservices.com/Sites/cds/files/57981768961.pdf
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/kusunivuziru.pdf
    • http://techbico.vn/uploads/image/files/dulazevevozufelele.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/a67fd183a514b0c0f51a6cd838b6e8bc/39738049749.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=cell+transport+unit+test+answer+key
    • 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_off0000b874.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB874 16792 bytes
font_01_sfnt_off0000d08b.bin
561024b9ed8b47490c2d35e559f9dde13aec2971751c79c960d38cd623d906cf
pdf-font-stream PDF embedded font (sfnt) at offset 0xD08B 10668 bytes
font_02_sfnt_off0000e92c.bin
f81f78247e3cf9f02216f8dc70bbaedcea3b688af2ec62b73904e082c4d5dfa2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE92C 16288 bytes