Malicious PDF — malware analysis report

Static analysis result for SHA-256 1312e1430904524d…

MALICIOUS

PDF

82.4 KB Created: 2021-09-19 03:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1cb3ecc9a67657d661270ff042d8032f SHA-1: 569a0ebdf20795d7e8529f269107339e0ed56a16 SHA-256: 1312e1430904524daf6bd212aaff5953cb1ab2af140a512ce50f7cac14073e84
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a significant number of external links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to obscure the final destination. The presence of embedded JavaScript further suggests malicious intent, likely to execute further actions or redirect the user. ClamAV detection as Pdf.Phishing.Trojan confirms the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://comitatoamiantovelodromo.org/userfiles/file/zebodafelaxupuzam.pdf In PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe946666e9---71740818805.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/m3db0kbtv7svescgb76vp4996r/57887801392.pdfIn PDF document text
    • https://alev.az/userfiles/file/moxanukekigivipeze.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/67476637949.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/30325275435.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/deforinetido.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/92638070590.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/63258449898.pdfIn PDF document text
    • http://saimiri.name/upload/file/kixakelemenu.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/dih6rrs16um98focif6m81kne0/kujagex.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161464b99f3308---nodujemasebikufumulokelo.pdfIn PDF document text
    • http://gdgom.com/upload/file/2109011430319773640z0cabhj8d80.pdfIn PDF document text
    • https://bio86.net/userfiles/fichiers/dutofezadegoxofun.pdfIn PDF document text
    • http://coachhouse.info/assets/file/81211696118.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/wabokitax.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/taremalusipazolemoforu.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/2827837208.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/93588541033.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/fabaperutosuweropifofem.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/43050229675.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/a3a308ca43fde12be0d30796665bbc2f/xorivebipas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=beach+buggy+racing+2+mod+apk+free+downloadPDF link annotation
    • http://tes-sys.com/uploads/ckfinder/files/20210912/16314581919287.pdfIn PDF document text
    • 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_off0000ddf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF9 11504 bytes
SHA-256: d93f8fc596aa44094361e1cbb3d38497750ff289c2a72947f6860a510c629565
font_01_sfnt_off0000f8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C6 16488 bytes
SHA-256: 4a5e3f4abfed11d48cf7cdc972a9b95b2260ef8aedfbb331ae5bd0ea11b06346