Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7e3d4418dbd56d9…

MALICIOUS

PDF

86.9 KB Created: 2021-09-05 14:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 535133ab5f96443fe8456d068e2e9941 SHA-1: 9473ccf73d898a46f15ed0f8e8f101a7e8091284 SHA-256: e7e3d4418dbd56d9dc97cb4e2169f2e7f167a6cf7f6eb0e111dab57cbf655866
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting it functions as a link farm. The presence of these links indicates an attempt to direct users to potentially harmful external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/13a0d69a820aff21d5b415c5c87dad10/30322531775.pdf In PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/69136825909.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/43cbb7641f27d6d1d753be7f640b0081/naziwokutikabaxabonomaba.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/89473029485.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/33666837960.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/43911960750.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/turikazabovo.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/ladibujuwirob.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/d1cf5aef099e65ecaa44e92ae2ade531/4360715263.pdfIn PDF document text
    • http://cjatkinson.com/userimages/wudegonot.pdfIn PDF document text
    • https://pr-dienst.ch/file/tizemepasasarubi.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/nosibi.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fufexisezelisura.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/f61c5f2385fb9aee5725f2a4f8e07458/86897179419.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5a0662a2e3---32425158753.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/llo6km0gi4uvl70pdbj1lg69a4/42447884147.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16112b32d2d271---sizivuj.pdfIn PDF document text
    • http://besteva.com/upload/files/regugapisu.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/18893902252.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc100b67a6---siresajedusajuzufubak.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/32221553214.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073745ed4699---xazibavedujitaronajir.pdfIn PDF document text
    • http://pensacolahigh1964.com/clients/1/1d/1d652d7f5bd5fd2f3712913460b20393/File/77746346079.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bf1d409f3---91696631379.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=audacity+manual+installPDF 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_off0000ef71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF71 18092 bytes
SHA-256: 656279615d43e859ea051267c7954cebb3b52133946eccefc53db44f98b302c6
font_01_sfnt_off00011e8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136A1 10376 bytes
SHA-256: d05ad5f5d057aa6dace681e055c23b5cf69fac1f135eee73115b29bcdeceb094