Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e428905a0132c47…

MALICIOUS

PDF

78.7 KB Created: 2021-07-29 16:26:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bdd1e2d00500c412f3c72b24bac8ffd6 SHA-1: b025305eb7684cbd44adf76f164650d09ba1a1be SHA-256: 1e428905a0132c4751c46482fbfceb8829da1210f10133da6a930ee5c8e3b409
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://pixomot.ru/uplcv?utm_term=descargar+el+talmud+pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff8814c24af---17976854554.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a1af8e7f86e---kikepopotanebafuvorodezik.pdf
    • http://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/leteduxubikigosik.pdf
    • https://z87992961.com/upload/files/20210716054940.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e6f699628---4347909750.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/c416307091f7380137bb9dedbbb48e4e/48696708093.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/r65l71pkq5s4u50jiaim75mmcf/29098018883.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/fac7f37175843f196db7b08aa1c4690d/sejowerodotixudixefitamax.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f319498ad75---71341114633.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608240bd8f491---garebasupaxe.pdf
    • http://fzcce.com/aimgs/uload/files/vinuxulilalanaf.pdf
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/91337258880.pdf
    • http://braciszewska-klimek.pl/fck_files/file/56562767678.pdf
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6481676035.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/f166f3ed444b3fe197960873a6d0abe0/36260658972.pdf
    • https://ppuhperspektywa.pl/files/edytor/file/bizomaroletoketazorizi.pdf
    • http://angarakshaksecurity.com/userfiles/file/notalidagano.pdf
    • http://dienmaybaongoc.com/ckfinder/userfiles/files/54591281787.pdf
    • http://angelojrobles.com/admin_initial_test/userfiles/file/rifezunabe.pdf
    • http://gourmethousemacau.com/UploadFilesfile///zexuvidamasosevud.pdf
    • https://nutricount.cz/UserFiles/File/xozutol.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/m8icv2ndhetpppqii58hnlecs6/17743783542.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/77f0ba06e74845e67659f568c4f37a55/27604394361.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_off0000ccd3.bin
a2f8af9dabdb9d3a2e5c94551c1be34c9c3942223168d2a445542d9409ae16bd
pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD3 10748 bytes
font_01_sfnt_off0000e572.bin
d3ecb8fd7abab8edf79e3488400b8e4d4bc0c930f79b16c064a7eb521869ef45
pdf-font-stream PDF embedded font (sfnt) at offset 0xE572 18484 bytes
font_02_sfnt_off000113e0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x113E0 16792 bytes