Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b4c151a7682cd9a…

MALICIOUS

PDF

82.3 KB Created: 2021-09-08 13:29:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9b3133e7ccc615a7975e558962ac89b0 SHA-1: 482c25b260ebfd3df99c030010063330e75bb894 SHA-256: 4b4c151a7682cd9a6043a6fa2c392ba769384a86b3baba48361ac34db76497ac
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs that point to other PDF files hosted on compromised websites. These external links are likely used to distribute phishing content or further malware stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://kronospan-mofa-hungary.hu/editor_up/79619923822.pdf In PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/damejawewejaduxabikatite.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/fekamopewiromikarexe.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135610119811.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210904010329.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ba7d90ff3---88236240148.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/67094396024.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/zibar.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/narubiletikuvororovakoji.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/86768293552.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a295e9b9d---87781482932.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/3746608605.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/420b0ec0aba55f6778ce731587cc046b/16684511843.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210908/file/16310873096672.pdfIn PDF document text
    • http://kvrhousing.com/uploads/rujinu.pdfIn PDF document text
    • http://roberlo.cz/www/files/file/5870494441.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/dejatulojaxoxo.pdfIn PDF document text
    • http://sro52.ru/uploads/files/64733201270.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/60483745872.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/50249561787.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/wuxujas.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f03891d5e5---9285563912.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161307ba784a4f---76867652349.pdfIn PDF document text
    • http://canissapiens.com/images/uploads/file/vufawumopi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=%D8%AA%D8%AD%D9%85%D9%8A%D9%84+%D9%83%D8%AA%D8%A8+pdf+%D9%85%D8%AC%D8%A7%D9%86%D8%A7+%D9%84%D9%84%D8%A7%D8%B7%D9%81%D8%A7%D9%84PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB92F 17744 bytes
SHA-256: c205c4e2597bb43142697e23508a50b48361869bf4b1bd905a4b7bd9963f872f
font_01_sfnt_off0000e586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE586 9372 bytes
SHA-256: ab692011bb810b4091e5b6863c1468cc19624005727076e0e42723678ec61724
font_02_sfnt_off0000f964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF964 19968 bytes
SHA-256: f7f725259e656014027462eab5cc3718c955f9e998f25968fc2f839dadc024f9
font_03_sfnt_off00011aae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAE 18736 bytes
SHA-256: df370d30ee7f2836d642abe62606558d37e5eefe4938d162671ebc4b7e3a9607

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