Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb4ec85880aba5d4…

MALICIOUS

PDF

80.0 KB Created: 2021-09-08 03:25:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 15a342e5ba38a6954de2e30665a777bf SHA-1: c3afd9cd12e191cdc01fb6d85bd948d0c81bc8b3 SHA-256: fb4ec85880aba5d40471de8a02c80356cf0df1c7eec87faa5082abe275f6624b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF containing embedded JavaScript, which is a common technique for delivering malicious content or redirecting users to phishing sites. The heuristic firings indicate the presence of external URIs, including one pointing to a raw IP address, and links to compromised CMS uploads, suggesting an attempt to lure users to malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/ponufejimutototutoxiradiv.pdf In PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/acrsrbdgpr2464ghnmasbmbeqf/vajelabuvakasomofusow.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/kogolovobopipuxanux.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/tubiwanenutuwikekiduv.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/33990904553.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/88682847108.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/722c8e190806c8acc1c79f4417d56f00/37830424997.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/16433995332.pdfPDF link annotation
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/55380242928.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf2471ac116---83159309677.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/45914526937.pdfIn PDF document text
    • http://axwelindia.com/uploads/96766265600.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/21898428538.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/runop.pdfIn PDF document text
    • https://suruburi.net/mm/file/xalulevuder.pdfIn PDF document text
    • http://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/94583335895.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/remawofejupakexazez.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/mafowufogogisubolat.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/bc3c54a960ac8f5823ce27bbfc57fdd5/joferiv.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/sinadusabipad.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/53h5gqn4nsb0sp40v89gpkk5v1/jekaxugotakuxoloniwekafu.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/19165176886.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/46d3d80949ddcd1226024d8bc5c4fb1f/kavizekonatixujurunotoju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=le+vaudou+pdfPDF 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_off0000d14c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD14C 10004 bytes
SHA-256: 1d0c848be80cceffe0b43aa5ce5c2cb2cb16cecd0ececac09662a10af776ab6f
font_01_sfnt_off0000e792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE792 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA4 19648 bytes
SHA-256: b1ebc160e7aa63b41bd6a97926c96c8c05907b26e4d34630a6d6e02401f1278e

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