Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5e3ea50621a1d98…

MALICIOUS

PDF

70.3 KB Created: 2021-09-24 16:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 485b9b171d2d554652ac86e4c424db48 SHA-1: afbe561a9e5d6f884e148d467cf3d14541b7b2ed SHA-256: a5e3ea50621a1d98f09bda2b5f2b81e8f8da9d1ba7ea9bb7e66616b334740aba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics as malicious, including a specific ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs, many pointing to compromised or disposable hosting, indicates a link farm designed to redirect users. While no scripts were explicitly extracted, the nature of the URLs and the phishing detection suggest the document's purpose is to lure users to malicious sites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://nomylo.ru/uplcv?utm_term=40k+space+marine+codex+pdf
    • https://cowichanseniors.ca/userfiles/file/fabisebirileresomamugubum.pdf
    • http://cestovni-postylka.eu/userfiles/file/febizan.pdf
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/milosuwugajotazaroxatob.pdf
    • http://lejonhund.com/upload/64805429318.pdf
    • http://palirna-frydek.cz/uploaded/file/75171022711.pdf
    • http://londonjip.com/userData/board/file/24960967661.pdf
    • https://hoangvan.vn/wp-content/uploads/files/zotigawetegawiwavetowek.pdf
    • https://dascalita.ro/app/webroot/files/userfiles/files/52747059482.pdf
    • http://aaronandanthony.com/userfiles/files/42313922742.pdf
    • https://globaltranslation.com/demo/global_translation/beta/userfiles/files/rijam.pdf
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/23267721511.pdf
    • https://www.abrasco.org.br/ckfinder/userfiles/files/rixedikolikonos.pdf
    • http://silverk.ru/img/lib/file/96102254541.pdf
    • http://kd-council.com/upfile/files/sezumek.pdf
    • https://jcmimoveis.com/userfiles/file/razevulipiv.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/p0t61jsvbj7todq1fm87l5elo6/solaf.pdf
    • http://villapellegrino.it/userfiles/files/74752214684.pdf
    • http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/pubiroginozazososugafif.pdf
    • https://audreyheselmans.com/_files/file/52261817430.pdf
    • http://i-akparat.kz/ckfinder/userfiles/files/89094165297.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/98e5f2deecfa9d043a325e8f6a085372/15057342573.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614105917ce96---54126252022.pdf
    • http://stellarp.com/userfiles/file/foxefilatojatonarosoreteg.pdf
    • http://papinchess.ru/userfiles/file/41228724408.pdf
    • http://aptekarynek.pl/zdjecia/fck/file/lanawodidasefelunalopato.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_off0000b22d.bin
1aa912d2a29eba22a73cb604849323a48fc0c20ca221581c9bd9924c95c6cad1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB22D 15976 bytes
font_01_sfnt_off0000da99.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA99 16792 bytes
font_02_sfnt_off0000f2b0.bin
6598ab9f695b17e5ba0d9e64385a2a7b2d36d4fea88cd6bb4894e9aad0c1b07e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B0 10936 bytes