Malicious PDF — malware analysis report

Static analysis result for SHA-256 c939af688b9931bc…

MALICIOUS

PDF

79.9 KB Created: 2021-09-14 09:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 352538363f0dd9467735b0bf5df1cfd4 SHA-1: e6f67dcbb68ed7825d6de0b21a7e25847aa39e57 SHA-256: c939af688b9931bc11238cc785898046c9d27fd7650096d671e71741fe3c3a04
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised CMS upload storage locations, suggesting an attempt to distribute malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of numerous unknown URLs associated with file downloads reinforces the phishing and potential malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/099ceadca23ca6a13338f7bb4987baa0/regivebeboroluvojoreduxa.pdf In PDF document text
    • http://chenruichem.com/upload/files/juvixejew.pdfIn PDF document text
    • http://www.centralperdana.com/file/kukosire.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/e9b7a727ac2c95dad33972eb93814201/koziwuginoduwasesunekufa.pdfIn PDF document text
    • http://haai.org/upload/file/92665997226.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/morofot.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/ih3agpmcllckutua8nn26ca416/17326334345.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ba0936151---dasimusunugo.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161300c20535d1---49869348411.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/55341558280.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/vatamuwemigatawivut.pdfIn PDF document text
    • http://inphilong.com/upload/files/sosilajaduradazobelulofav.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/42432373672.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/10613319432.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/39159567660.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/bonukitek.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109132224462596.pdfIn PDF document text
    • http://shangyi-pump.com/uploads/file/072027296160.pdfIn PDF document text
    • https://doitoutdoorz.com/file/jbpj0wjgYCDI8TyK.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/fedufumawokuf.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/99090691133.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/vigewilugavoko.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/12108063315.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=tap+top+apk+downloadPDF 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_off0000d457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD457 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6E 10036 bytes
SHA-256: 3fe9b0186113c0ca69b71b0e0009fa066f97aca608f44f3e8d7c4f7d33f86da6
font_02_sfnt_off000102e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E4 18280 bytes
SHA-256: d07d6779f95a53ba8ec1664ede7bfa5387526ea3d7de12d232c444c5ae552f19

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