Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce37408abe80eb21…

MALICIOUS

PDF

81.0 KB Created: 2021-09-10 15:13:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 10da7fabca5d0c814a5fd68478544f2d SHA-1: 95bb2f1f0c299d10d5a96f400521eec46a61ff10 SHA-256: ce37408abe80eb214100d1d0f74e86333fa95b15ceef9e3f5a2e45cb0d1b26c1
204 Risk Score

Malware Insights

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

The PDF contains multiple links to external resources, many of which are hosted on compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malware. The presence of a 'password-protected archive handoff' heuristic indicates the document is likely a lure to obtain a password for an encrypted payload, a common tactic to evade gateway scanning. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://alumcity.ru/userfiles/file/zopubefilaliwafeja.pdf In PDF document text
    • http://aygroupmuh.com/image/files/82586893235.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/gotuwugepofulabonuloto.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/xijek.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613180cddb8af---94121885944.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/sijaxalesoxiliburitefajim.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d9d1bad8e---kipegonakuzorovokorefozaf.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/pibovenevepevugavogu.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/48457733948.pdfIn PDF document text
    • http://beiks.info/public/file/56106822194.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/rezofujenetuvef.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/22483196190.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/maresiwum.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/ghnsrfmaib3cd60nr1h9vpj6oo/50752724727.pdfIn PDF document text
    • https://usgcambodia.com/userfiles/file/58700863207.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/46311175178.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/67470404025.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210910_7B0C1798C715239E.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134fb6c078bf---32879561828.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/24t0mo0fgavlofebidb6frvna3/suguzuvinojewonogem.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__613ACC82A1BF7.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/15395543128.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/48235512203.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=download+ultimate+ninja+storm+4+androidPDF 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_off0000d5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF9 10804 bytes
SHA-256: 3f71d426508cfcf5cbcd8b814464a6032ec70fb1c940cb85fe817e1e90514240
font_02_sfnt_off000106e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E5 18276 bytes
SHA-256: 3129d2344c600fc386fd2d2b558ccd1d7f7b8bf9d79d1b7829cd2a56cae1d677

Open this report in the interactive analyzer, or submit your own file for analysis.