Malicious PDF — malware analysis report

Static analysis result for SHA-256 8939904ff5974754…

MALICIOUS

PDF

86.7 KB Created: 2021-08-21 10:23:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 869bf60b6f15fee6c04522026c8c4bf9 SHA-1: b02ce8bcf74101669460ad63e46f8c315ac92690 SHA-256: 8939904ff5974754639a250b16993b10bb78e8dded4f09ba97fecff4cd00d6a5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • 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://yevres.fr/ckfinder/userfiles/files/rizogidukajunujolu.pdf In PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad682c71c8c---67495934533.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/14061853872.pdfIn PDF document text
    • http://safarang.com/basefile/files/gimabaxazivevegunilabana.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/febelo.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/zomomuwuruwuj.pdfIn PDF document text
    • http://atallmed.com/userfiles/files/jeguzukewadatanedifakufi.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ccaa6d8d1---fifovapiworoxafelotujobul.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/qeli773t705n039brljk8e70s9/dorenijazupilupomenogawo.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa34dc9dbe---jejutapawizepa.pdfIn PDF document text
    • https://lapiadinafelice.it/file/63470853935.pdfIn PDF document text
    • https://mauspro.net/upload/files/14883188202.pdfIn PDF document text
    • http://cfacgroupe.com/uploads/FCK_files/file/rufomuribiw.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/tajodufirali.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a3461e2863d---59623705171.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608afa1063a13---zojubugixukasidoxuni.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/72dc22487813138f90fc03bc5e4955f5/sowijipufe.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e6183d83bf---kaviwelut.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/c5c1e43c3e6ba14d80eb730d2b3940fd/fazepupuvemogarune.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/9b5795e175f323ee832fcde7dca4cc9c/95242132327.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/zurezori.pdfIn PDF document text
    • https://pixel.bg/img/file/42162059902.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/nudiw.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/jolekidunesawaxakup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=solution+set+in+interval+notation+calculatorPDF 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_off0000ed4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4E 17736 bytes
SHA-256: b59c3d9280456a54d8e688a9ede133c1dc01e9ef935f3a5bf9d3ce9c13d326b4
font_01_sfnt_off00011c41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C41 10464 bytes
SHA-256: 7a6d78fb4f6bd1b163d631cc9316c8bfad6eb21c51537a29e6d18b010faf3f11
font_02_sfnt_off00013425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13425 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1