Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb5137d8599aba50…

MALICIOUS

PDF

86.2 KB Created: 2021-07-05 15:14:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3b608eb626314a2b99688a92929863e7 SHA-1: 8d93eda7297e551104867fb8fee0dc2ec494efef SHA-256: fb5137d8599aba5090a2a90737f48bd1d4477f3c53d0d0bf41a13e60ccdcec24
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress installations, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to phishing sites or download further malware. No scripts were extracted, and the document body was unreadable, so the primary indicators are the heuristic firings and the numerous embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://wills.sg/wp-content/plugins/super-forms/uploads/php/files/e9e8fcc8b5989edc2490842b1f84393d/tudebuxutuzixebuzewusulop.pdf In PDF document text
    • http://arch-teh.com/pic/userfile/ladijipepodejitusomasek.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f177f56603---waluretupadasajetev.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/33586782432.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/d734a9f9787aaf6f327e42b21eee4d09/72858127473.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16070140b573c9---58562332831.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16079654d71887---44246717961.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d62d603ee40---xapokuwonivozurajudi.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083cca51685b---zupisuvidididalijepuse.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/3blq2kugk0cvad2t2vhb62vap3/4211163267.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/zogusepizizemiz.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/86083888103.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/tenuwoxipuperijivug.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/jemanul.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/xexifunade.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/sipoz.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c290581efde---refotakonepimulafo.pdfIn PDF document text
    • http://birminghamseaholmclass63.com/clients/75362/File/87596984295.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/fodasezunez.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/3g037tfstgtjhps3fhnr3dmsq0/27835332894.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/30542338150.pdfIn PDF document text
    • http://theettiares.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/jifalufibubotipujupunupew.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096b78adab82---40554133398.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=dream+league+android+2020PDF 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_off0000edf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10609 17312 bytes
SHA-256: 18d030d9a90c7b87d02c2f8b1f980fb90fbefcfb3f04e6de025d6391b200e8cc
font_02_sfnt_off0001337e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1337E 10668 bytes
SHA-256: 954a083edb28c6e7fee9346bc935d6d4d55fe1907f53e3644f396379f178a417

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