Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f5fab6979612714…

MALICIOUS

PDF

61.4 KB Created: 2021-09-17 13:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e4834d499520e41168a36b2bd214b85f SHA-1: 5072cd826036426bdbeba79b0b8f76d643edb71b SHA-256: 5f5fab6979612714fa6db5a9bdb8e4c9ae2aa0b763fad40535580986c8227f63
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a strong intent to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5765

Heuristics 5

  • 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
  • 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://oniceh.ru/uplcv?utm_term=tamil+dubbed+movies+online+download PDF link annotation
    • http://grimastone.ru/files/sotavofigolabinutula.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/79609101e99b041c8fd4e122b59cfd4d/76828765555.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4c3732fc1---kezefipinugunami.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210910_D14D11E4F1A41CE4.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/40394776517.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161437a5bb6dd2---38515042848.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613038058dd12---26779307914.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161432e1a5e40a---26505761614.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/72127666391.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/garafa.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/52809397318.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4e083e82c---16591562999.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210917165003.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/ziwavovozonukafibol.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/pepanarutogumat.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/35073816024.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/regikazeboxudiba.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/c075378206ba313cf9cab531c42c27e5/31765588870.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/nezokotowegipiweritog.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/92921891955.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/xotugiseduja.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/6980869111.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/71076489240.pdfIn PDF document text
    • https://shinko-tw.com/UserFiles/file/suduxorozivato.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/kawimilizilesaruwig.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/851bbbf209db0f42ae8dfc133588f5f8/78226962430.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E5 10568 bytes
SHA-256: 64f00be0342db1be0c0cc3ec8078c8d8b70231d4c9f17707bc634035b7c66b5c