Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bb3605ce55c166d…

MALICIOUS

PDF

85.8 KB Created: 2021-09-18 15:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2f3002d4861fef8721ac41041143fe25 SHA-1: ac20388e98ef40ed4afd6eed2f25b7eb8b9b7ff7 SHA-256: 2bb3605ce55c166da5628b1e7a3e335632a36f1834233c8ba57c7cd6bbbf035f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload storage, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and embedded URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133971cdf249---71929182344.pdf In PDF document text
    • https://cezartravel.hu/userfiles/file/35627103551.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/73746212219.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/puteb.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/muxale.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/18983405509.pdfIn PDF document text
    • http://datacomsystems.cz/userfiles/file/83203471102.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/mivivizefafizitibodepidag.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/xoduge.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/fawelisixojufovobelat.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/walosijumaburujaw.pdfIn PDF document text
    • http://topas.lt/userfiles/file/wugafiboxesife.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f19e65db6b---zifaxukumagunadopasovox.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/36836202148.pdfIn PDF document text
    • http://thegoshow.net/userfiles/file/niguxibu.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/62469278327.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/8226098241.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/mavunebikebum.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/26845226245.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/64465520689.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/maninefixafix.pdfIn PDF document text
    • http://www.moyekolodin.com/files/rajuwevawot.pdfIn PDF document text
    • http://gyliver.ru/files/files/matipi.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/8b5572b70c2a89d7b93e1fc4359bd332/57755343825.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=married+at+first+sight+australia+season+7+reunion+watch+onlinePDF 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_off0000e9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A8 17616 bytes
SHA-256: 0869f9f0a69213092525a747b5e49790ca724b5886ab3373b81fbc0badf806b9
font_01_sfnt_off00011733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11733 10984 bytes
SHA-256: 5ddc76401c0035de730ccffc681255b6759c73c82fdec372dfff549fa276e71b
font_02_sfnt_off00013090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13090 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1