Malicious PDF — malware analysis report

Static analysis result for SHA-256 e948de33403cf872…

MALICIOUS

PDF

90.6 KB Created: 2021-08-05 00:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 496584ce781509700769c500bfd9a116 SHA-1: 9cf0566e01439e80a6048687c7166ea60ff82142 SHA-256: e948de33403cf8722f0712eb95780459984e59e129145b17bf23101bb8e279ea
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a272ae9faf2---xilizewig.pdf In PDF document text
    • http://eventologia.com/userfiles/files/24323558711.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/780fee34ceda1f9a129dc37d503eedfc/xekumavib.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/rijuwirarevabosufe.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/69899393823.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/47kpie0megp0guo3kcj7efdn91/35325358888.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e54f30f52---lexidabe.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/dokivodekivapofu.pdfIn PDF document text
    • https://axlthailand.com/imagexx/files/8532994380.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f68911e0a6c---rofisefivagixoresilovitir.pdfIn PDF document text
    • https://mintowncoffee.net/uploads/images/files/botisuritaxarizu.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/6022f47cabac65a2a32236e3cb4252ff/zenejatawifuvusixiwunakor.pdfIn PDF document text
    • http://szwygs.com/upload/39877913790.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/m1l7nhhg5fh8qutpn6g1sgqj92/fuvedup.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/zijegufuxadafusofikura.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/vimalopabazowinekuludusu.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/isonktpo0bfrphoigl0go9r8i8/befakajizojek.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/21944784827.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607968436a09d---bagemufe.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/vadivotugi.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/saxufivibamivawes.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cb446264ac7---gabibuxopisob.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/sivhh2a3pp999n6lqmfm5f83f7/30221149921.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+do+google+scholar+searchPDF 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_off0000fdc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E0 10528 bytes
SHA-256: 8285000a4c9e1cc8e1fa4097d5c826af37628e24bd4a6fe7303da20148794333
font_02_sfnt_off00012dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDA 17384 bytes
SHA-256: f1785b1952a4ce03c2827ebb82f2ffbad5d8364500ac34af5202141cc2c532f9

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