Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ea405eadef8b8d9…

MALICIOUS

PDF

77.7 KB Created: 2021-09-10 12:15:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 1d16a6624442d3bd3abc3171a9fb6605 SHA-1: 49c4a5f31c00378f9d3548ded62da65a1e2e91e3 SHA-256: 7ea405eadef8b8d97850ef208084354efdf0595b96848b855498d0b53681541b
204 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pixomot.ru/uplcv?utm_term=android+pattern+unlock PDF link annotation
    • https://vongtaytramhuong.vn/upload/files/korovowuzubigavumitasigef.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/35178158240.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613773f7cfb38---26321782422.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/tufuru.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/wawedugonovoxopukeko.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/joxejikolixetetagalojuz.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/14742494171.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/60146022064.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/99314488634.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/pdoqgdk8tssj3gf9vbopie6a2q/1617585809.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/ronedixipis.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/nuvidutiporuwatexodagasa.pdfIn PDF document text
    • http://le383.com/uploads/files/66108600488.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/93038494026.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/40298807844.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/wanimezuwonebomenovim.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/buea65vr15tcf3gkf96sp6fgnt/23678711556.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/wokaruvijamegojorabiv.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/bexos.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/64003500594.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/gojozetexobotojolona.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_off0000cc2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2C 10512 bytes
SHA-256: 37e70d21fc705369ffb983b1ab58b8396e1b2506ea713ae18888ad4365752763
font_01_sfnt_off0000e431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE431 17400 bytes
SHA-256: d67a6c657390a43d19d24ce121dfa8ec4a8024531a4f72637a5719ae2e0f3d52
font_02_sfnt_off0001115f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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