Malicious PDF — malware analysis report

Static analysis result for SHA-256 403a09f020b50671…

MALICIOUS

PDF

84.7 KB Created: 2021-09-05 13:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1df55e4292ead7917ca99e3f9f224415 SHA-1: 3f230972990298642bf3e2e9eb4fbb16639b70c2 SHA-256: 403a09f020b50671c5060252dcdf6485874073109d6877ee4e2ec5e2b9ddf053
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bae995fcd---mupunobum.pdf In PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210622_170538.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/werotixek.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/zenitagovofiwaxatawuvu.pdfIn PDF document text
    • http://www.bandungmesin.com/file/zumurumanul.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/menekogekojewagapejofebop.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/75136420688.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/27450647243.pdfIn PDF document text
    • http://ttc-investco.com/img/files/sepozafedub.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/xeworonunoka.pdfIn PDF document text
    • http://klhl.com/userfiles/file/taxolaxeba.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/43084739276.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/8395595161.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a584b882828---5985005366.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/e4rbcp4olork9rj6fkglbbbra3/mekifufapobuvekepa.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/71060011539.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/55429774369.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/284468815.pdfIn PDF document text
    • https://wodgluch-projekt.pl/userfiles/60623510531.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/werudagasigetafur.pdfIn PDF document text
    • http://ilkconstruction.com/Images/Media/files/judowuze.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/9rvgef0rb9ef18250ff4jc555r/lakedexelisilaliw.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/wopegudorozatixosizowovuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=yle+starters+sample+papers+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_off0000e45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45A 19000 bytes
SHA-256: f96dedf21c3818c3e17f6cba5c64e7a0b85710e78c050afe7fbc70d66d3159bf
font_01_sfnt_off000115ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC4 10324 bytes
SHA-256: 3629e48e1324fddda6b3251bbfa431eed75133ea78b6bdb087154a053ed1b117