Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cdf779397709d72…

MALICIOUS

PDF

109.7 KB Created: 2021-09-20 06:23:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a7ed36853dbcae7e1fa3fc5de4f01451 SHA-1: a5c648dcdc968955375b47351349097046022fcd SHA-256: 0cdf779397709d725424b4351604901bc163623618f8af066505114024b40976
196 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 compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'SE_ADVANCE_FEE_SCAM_LURE' strongly indicates the document's purpose is to deceive users with fake lottery, prize, or parcel delivery schemes. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://chcial.ru/uplcv?utm_term=warhammer+40k+core+rulebook+pdf
    • http://dogomanhnghia.com/uploads/files/zewopegijibufibemaw.pdf
    • http://thucphamchucnangmy.vn/uploads/files/daker.pdf
    • http://itaxabc.com/userfiles/file/20210916135212_453715930.pdf
    • http://veoguidecostarica.com/ci/userfiles/files/66750729444.pdf
    • http://ceresasrl.it/userfiles/files/2563544830.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/34b28fufarm7cjs4p0fbd1rpmt/82397702083.pdf
    • http://cafesezony.ru/fck_editor_files/files/12177503941.pdf
    • http://itineraire-consulting.com/ckfinder/userfiles/files/pulogexinufamifup.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef3cc7af7d---zodimoruvuso.pdf
    • http://stphilomenaonline.org/userfiles/file/37822031654.pdf
    • http://naturallabs.de/userfiles/file/85050900201.pdf
    • http://synhbio.com/upload/files/79713479978.pdf
    • http://litho-and-co.fr/ckeditor/upload/files/59048759557.pdf
    • https://mudraconsultancy.com/uploads/files/81523685424.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613023037cdfe.pdf
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/kikipipuf.pdf
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/lutuv.pdf
    • https://777mto.com/contents/files/revebajimitivujokabu.pdf
    • http://agataklimowska.pl/userfiles/file/67082036989.pdf
    • https://pragatitic.org/ckfinder/userfiles/files/55955953463.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c89390119b---negulinobixuxomupakelub.pdf
    • http://mail-ex.net/userfiles/file/39816814491.pdf
    • http://www.tecnobor.com/ckfinder/userfiles/files/18486553948.pdf
    • 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_off00014310.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14310 16792 bytes
font_01_sfnt_off00015b27.bin
d07af0f601d6bc7c86a665787e2b717b483af43a804609226756269a1ac1173c
pdf-font-stream PDF embedded font (sfnt) at offset 0x15B27 10948 bytes
font_02_sfnt_off0001744e.bin
f47bac3466a57f3654b0f1e62ee3426bf65e195cbde3d283bf593c74237b74c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1744E 19988 bytes