Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9d0205dca10d8bf…

MALICIOUS

PDF

94.0 KB Created: 2021-09-05 09:22:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f0382c8f3591a853a54a1282e456001c SHA-1: efbb548a7eb09a27b1115dfac3d5386d6efbf21b SHA-256: f9d0205dca10d8bfa17a1cceec34b3888ed90f994ae81894f910ec86435e2d98
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. Several heuristics indicate the document is part of a link farm hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/6671466d75117f8b3fbfcb7abe3c0bbe/vinizoluwugufaka.pdf In PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/f237ae17461ce700e2bc0b3f173021b5/bimilakepovozuv.pdfIn PDF document text
    • http://canvangdientu.com/images/file/tuliwetufasega.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/63829069273.pdfIn PDF document text
    • http://daydala.com/userfiles/file/larazesigovivipimeku.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4bb0cd51d---mezinokefopifavijumel.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a43280f2e1---jowavemufageg.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/65108495279.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/97154185959.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/13658517124.pdfIn PDF document text
    • https://spacio.hk/attachment/file/todinupefonedegezogekijax.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210622220946.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/3044715010.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/60b4e7a04bf35.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/20937361414.pdfIn PDF document text
    • http://www.heksan.com.pl/file/gabasezotamizenifapupezen.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/wagojotikarikejopolo.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/vubanuwul.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/beriximarewavebevolobev.pdfIn PDF document text
    • http://esthebel.de/userfiles/file/fubejutomuvirugepumilo.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/t3ricq7hr572lc3etrmdtm75l7/75969513845.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/iukl48vtn2fm3tet81o29gc8hd/6917515169.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/senefakiwotowe.pdfIn PDF document text
    • http://lyonsmcafeereunion.com/clients/a/ab/ab8eb7fa8d7cf94b91f67e7e346c80ed/File/nejuzix.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc238f80b19---kelofubefezagin.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c5f61ddcc---vufawutos.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/fekapobupusixaxovibizodir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=fridays+restaurant+menu+pdfPDF 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_off00010a25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001223c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223C 10684 bytes
SHA-256: d26845abbb51233346e8b72852bf9e0550efa89979a27bad279d0f34e8ac2b48
font_02_sfnt_off00013aaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AAF 18036 bytes
SHA-256: 74d19a0702dc477622efe5d2273e17684b72840a4fa8b06985c55214d410da57

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