Malicious PDF — malware analysis report

Static analysis result for SHA-256 c048ad41d6a04228…

MALICIOUS

PDF

78.7 KB Created: 2021-09-16 23:59:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fd104959e74b67f46094a19e482c57cb SHA-1: 69b8144eab3dcb968babbe9b73e41211b4da6554 SHA-256: c048ad41d6a0422858c4ba85efb8680cfbaa3e179e2008ea5f6b37352e8c5191
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or other potentially disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern observed is the use of a link farm to direct users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://magiccat.pro/ckfinder/userfiles/files/rowukinadum.pdf In PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/64444798491.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/xefalixadituminu.pdfIn PDF document text
    • http://labotinnghia.com/img/files/fasinutewujebupep.pdfIn PDF document text
    • http://spbi.cz/res/file/bumejafarikuberobofegisi.pdfIn PDF document text
    • https://riminabda.sk/userfiles/file/95582162163.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/42846654409.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-9-12/20210912002547903285.pdfIn PDF document text
    • http://ilkemymm.com/image/files/zugosajazefajad.pdfIn PDF document text
    • https://vitanov.rs/files/27427106802.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a231be7465---bolita.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/gebabugurokasajow.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314e60af493---35242730610.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/37ea95516ab614848a7c7683d45b5168/dagotiwumemipatigasije.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/gemow.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/v1ikqeg8pctimbpqpsthe2svg5/94221462039.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/lakakipelezasazetifaro.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/lulusasa.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/43505087622.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/83128934119.pdfIn PDF document text
    • http://ping-property.com/user_img/files/gikozix.pdfIn PDF document text
    • https://havilahbuilders.com/userfiles/file/letaporadapizamo.pdfIn PDF document text
    • https://esvigo.com/upload/files/tesuj.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/lebijenobikijuxamovadabe.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/32773240474.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/161328b277e8eb---86375418404.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=korean+website+dramaPDF 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_off0000cff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF2 17212 bytes
SHA-256: 1a92bc8aa8e15f0cb46777d92d12004b8d8feb3f3882a89195e901f6f4a33aca
font_01_sfnt_off0000fced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCED 10580 bytes
SHA-256: 8d2cda2eaa0ef0489b14f89abccca9241b791735251913b22f1e71fac7d0761a
font_02_sfnt_off00011522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11522 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1