Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9fbe73ef3429576…

MALICIOUS

PDF

87.1 KB Created: 2021-07-16 05:26:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d774756d74dd688ae6fa233c6391185e SHA-1: 809b2afe4d4f2b67de86f24a488d3a9c266200fa SHA-256: d9fbe73ef342957603f5e746dcafb1102c5c2325a2f11db5b38c409c29cee1c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://philabc.ru/uplcv?utm_term=different+types+of+gun+slings
    • http://mariopresto.pl/userfiles/file/43926809617.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/2cfbb1a08df211c1fc573ccb286c2f85/gatarukafudotevariwowura.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/rkomqirek13hgh114qlb39c1fu/46056320676.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/s0a03sg1sn9ou2vc4bjsaoldmd/89802160961.pdf
    • http://gps-tw.com/CKEdit/upload/files/lunupezipotomuvefavusi.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb052b438d---58999274283.pdf
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/ls01u53do7mngddsc9keidm7u5/mowupijuvokipu.pdf
    • https://esperanzadeavila.com/fotos/file/35354659567.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/s3trsvpq33bum46l8b4i98m4b3/99616545972.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/2a750c422e6a576f95765480f6b42e9d/xalomimibedi.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/c4bae3c0a22819f978fe1171c62fea52/situwebesemubima.pdf
    • http://kolasinprevoz.rs/slike/files/vizaxepeputimuzivi.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850e6ed6b72---23403097741.pdf
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/gotowusafilegup.pdf
    • https://chris-arnold.com/userfiles/file/xabagogipuzagez.pdf
    • http://muzycznescyzoryki.pl/userfiles/file/jejinunis.pdf
    • http://aaaexpressac.com/userfiles/file/kositixajowasekaraluraso.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/84b07a489ad1b58e88b44f8f0c3dce00/55420956707.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ecdbe7345b6---wunowasotatolalenotomovav.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/94457177565.pdf
    • http://live-net.it/file/23810815015.pdf
    • https://ivanamihic.com//files/pufodugobola.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4fbc96afd---nisad.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/1905b86fe19b693e4a2b47e2567211bf/23855257906.pdf
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/f45c394f5ff02472a929b5dbff77d846/vejegute.pdf
    • http://1hozain.ru/files/userfiles/files/kixosi.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_off0000f311.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF311 16792 bytes
font_01_sfnt_off00010b23.bin
875a072588af75017a123944b98d46181d92cb3682dbe48b30d8558db7aa5932
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B23 16820 bytes
font_02_sfnt_off000136c8.bin
0422318decbebd1f5d760a625c47232a1bdfdbc1fed541b01d5ae0050509a0a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x136C8 10588 bytes