Malicious PDF — malware analysis report

Static analysis result for SHA-256 1356dce985b4591e…

MALICIOUS

PDF

115.8 KB Created: 2021-07-20 02:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d423d3fd57c19b9970a83dc8a7d73f34 SHA-1: fbc74dac0446d5aaf0bb51860f97a8a001324083 SHA-256: 1356dce985b4591e79095fa788c1a9fe5c92f82c98c5bac0f80b4e8e69ae9981
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, so the primary attack vector appears to be social engineering via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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 https://kuepancong.com/contents//files/16876787014.pdf In PDF document text
    • http://finproekt-msk.ru/userfiles/file/85110050096.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/20725769778.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/c3okajpkk8mstkij0f3terjlap/92423007413.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/xagesitolaxoxalobavitix.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/b7ed671bd641bf788fe49303ea20c375/matufapagab.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/58043c70071a41758c0be004ffe9a373/vinajiw.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9bc9b136b---zutinofabekomazegagunakit.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/0b511aa98ae93d0e83b4c839b89b5109/21812459053.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/48812804718.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d9eefe69bed---23152419008.pdfIn PDF document text
    • https://avayemehr-carpet.ir/data/file/51747929644.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1eb0f144f---duxelivinibakaweradu.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/35744161359.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/42287973200.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/5570495207.pdfIn PDF document text
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/majujisosiruz.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/17527595064.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210710115001.pdfIn PDF document text
    • https://efnnma.org/files/file/libaxoro.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8e66073fb---18014420876.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839d4865aa2---mezad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=today+gold+rate+in+nepal+in+indian+rupeesPDF 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_off00014a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A1B 16300 bytes
SHA-256: cb22297cb345efa2b973a5529f7d34f362c2fa401ecec879e64cb16b1dda6a81
font_01_sfnt_off0001603d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1603D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001784f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1784F 18112 bytes
SHA-256: d35b786b13392868b5d25ebd59acdab36176b00536cc0e4460c3d1dce7df65f6
font_03_sfnt_off0001a711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A711 10744 bytes
SHA-256: 7e8954b3ff8ad08afa5b37bbb1b83ad7f27191cba7ae36ece54e4d1c7b488e6a

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