Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdfa201959c1e57d…

MALICIOUS

PDF

75.6 KB Created: 2021-09-01 04:31:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ec0b4b39a7c715e8cd277535969e2dd7 SHA-1: 2d00c21cc44fa6b390163540d4ba70af7b0f780a SHA-256: cdfa201959c1e57db2afc957bc360d613fdde731a9f91f1d3790680cec24f95f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8bfa16204---92406215986.pdf In PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe46a4f88f---99633504211.pdfIn PDF document text
    • https://lifetides.ca/cambridge/uploads/files/fobogalijewanalin.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/594bdd58a1bcceef473d006b5fdc5bca/fuwipixufufobolererak.pdfIn PDF document text
    • https://506hlapeta.com/files/file/zazaragogalanewopedijopo.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210822_113044.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/bapujutubijalulavemoz.pdfIn PDF document text
    • http://juentai.com/userfiles/files/xemozefozi.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/xowigazesatinakapov.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/f46138b031852c55e3ff56158255f8da/vorufe.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/zomeruzaxugukizomisetu.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/35764100127.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e9cd7021e---dunilagemimizav.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/lagorunime.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/widafog.pdfIn PDF document text
    • https://flyags.com/editorResources/file///50115694173.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202106290137593556.pdfIn PDF document text
    • https://invest.pl/userfiles/file/dimazizetuvalenuge.pdfIn PDF document text
    • http://texmet.pl/userimages/file/2678363653.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/f171f2226351b862089a5f8900e7d91d/tukireto.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6935dc419---fisewadebibaxetejufafep.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/78304313515.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fef4a3ee1c---33563450316.pdfIn PDF document text
    • http://torgoborud.org/images/file/soladamivok.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/pefirelenolorositeti.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a43a4216ae2---sogugitonatazepupime.pdfIn PDF document text
    • http://toyotaprius-custom.com/js/upload/files/jepuveluresunewiba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=123movies+faking+itPDF 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_off0000c319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC319 17264 bytes
SHA-256: 9d29740a56331ed8d5198938337179fd6a468bde7ca8c18b9067b2c6f400285f
font_01_sfnt_off0000efd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD4 10816 bytes
SHA-256: ac1aa1c62930f4d9d046e886082921983e4ad6b03be1f29b4b3e84a1a0bef0bc
font_02_sfnt_off000108ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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