Malicious PDF — malware analysis report

Static analysis result for SHA-256 e31c044dec265044…

MALICIOUS

PDF

81.1 KB Created: 2021-09-11 07:38:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a5e4545d4616046a4e6f394613e0d0ba SHA-1: f3a123c752928e0c25d4f42687e3efdf34d29e96 SHA-256: e31c044dec265044f7f92579d65eaed505a6628af8ac37768479d102387628db
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress uploads and disposable hosting, indicating an attempt to distribute malware. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document is designed to trick users into downloading a password-protected archive, a common tactic to evade initial scanning. The ML classifier and ClamAV detection strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/fujifikulubanetaguvoboze.pdf In PDF document text
    • http://infinijewelry.com/userfiles/file/nevimiwemewakepi.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/7882e0c242d8fbf0a00f600b5c4a4d99/43938764035.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/57534492844.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/15994446846.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/83026837685.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/kalamima.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372b70e8078---ludinefejuzifinemawavop.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/74975424702.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/17601994108.pdfIn PDF document text
    • https://edex.co/userfiles/files/renijejagareroxemafopuz.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210909084147.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/n2l8m8gsrgs09qk832injkerde/85724473324.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/wulavelinabupud.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161302ce0cce01---77966421640.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/mikusese.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/wewadavo.pdfIn PDF document text
    • http://termocity.by/pics/files/tejigu.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/84762243140.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/38923913871.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/11495670840.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/nosijubipaxajewamebefu.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/kejilema.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210901_111559.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=bypass+android+lock+screen+passwordPDF 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_off0000d801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD801 10752 bytes
SHA-256: 7917d1063901d3303ea4793f1e8874cfaafa1e2794ba796e54d0df70a86ac0b2
font_01_sfnt_off0000f0e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E7 17416 bytes
SHA-256: 9a14d1c4678a92e2a4d511fc7817475103707562503d581ad8390a4a624a8265
font_02_sfnt_off00011e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1