Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc061ca6841df1b2…

MALICIOUS

PDF

73.0 KB Created: 2021-09-03 16:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d5e34b60c8bf9813b7c6f361865004dd SHA-1: da19367612a76e5ceb3d86b17e12d9a178d363c1 SHA-256: fc061ca6841df1b2c67458e435d1e9d7719f3adfdab795151d21e33cc8fde5bd
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites and other disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to external sites for further compromise. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/2t95cjnnhsn70lhtfk2a4cgdjl/29845561337.pdf In PDF document text
    • http://qdsenfeng.com/data/files/rilok.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/60639155516.pdfIn PDF document text
    • http://hi-techfiber.com/userfiles/file/20723519998.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/wexonu.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7536a6a12---77470721904.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/jifttcm0ev94arla4s39rqq3og/balulal.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb64479f6c---88916381320.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/9be0fe1ac606b542040d8d9d6176aa5e/ravekujewamelitanaki.pdfIn PDF document text
    • http://cobbpaynefamilyreunion.com/clients/862770/File/xofexusuzorega.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210623_DDC4EB6613E6953E.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/raposun.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d831034ada1---rowerojazuwadaleg.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/60422984998.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/75902012713.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/sinujunubutagajezo.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/43341451427.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090c72ccb32b---61175001560.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///boginezurup.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/76753374211.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ae60d92e158---81002858140.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/3610985705.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1224f7jr5d2hr0oo6pkd8eeb76/gazegisepuvuxasodadiw.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609114b9cc614---72423603583.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=medical+physiology+boron+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_off0000bb9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B1 16340 bytes
SHA-256: 71ab3e67c8dc20011f6c04dce1d1cdc864bc23671eb1a8f59db8e134340c0f41
font_02_sfnt_off0000fdae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAE 11048 bytes
SHA-256: 3e70d5ea46006c43d9b7feb1069791a06eca86cddce466d04bac7d170ad51e06