Malicious PDF — malware analysis report

Static analysis result for SHA-256 9454f5e66c963ad8…

MALICIOUS

PDF

89.7 KB Created: 2021-07-05 22:27:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ad86259b48787bdcb974e3483514425b SHA-1: 80bcc4b0a2bd8b988a1fe6a45d409329b68ba527 SHA-256: 9454f5e66c963ad8fbedcaff36d2e791a3cb2e66254d28c73a5dd883a09251cf
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is often used to download and execute further malicious content. The document also exhibits characteristics of a phishing lure, specifically related to invoices or payments, and contains numerous links to external sites, some of which are hosted on compromised WordPress installations. The ML classifier strongly indicates maliciousness, and ClamAV also detected it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/pv19ssv8p5rr0bi522adi5gq94/girunosoxunerixabavuram.pdf In PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16070c0cc877cb---36780382847.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609381c723a12---75435227236.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c75bb1c706---88199706764.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8897dbc30---tokafapuzironab.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/5ebeca031d487dc08a8c7a0d29182028/22390479177.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/2b5ajmu3ka412amuqml75mimfd/36910675944.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/e2f14faee1b9fc36a714d9764796d137/31872873455.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/15115192309.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/pukenurumenajopa.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/kigaxanenojelumesir.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c61e48456fb---sanexamivupikoxovuvuw.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/nokunakedotononanokitidew.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/dazexarejeru.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/12077992173.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609357c94a15e---70196817101.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/koganakopitomofupudal.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/0a0f301f36c7ce60e97954f844014123/50743289320.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bb84352748b---66432257840.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/93a995366c752aea76797b88e490be58/5209451312.pdfIn PDF document text
    • https://ocbond.org/userfiles/files/puronusedagoworobabo.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/81244271142.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084e11417817---18649962354.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=roommate+expense+tracker+excelPDF 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_off0000fc2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2E 17156 bytes
SHA-256: 776d5b21dbb71ea485ed7a6def2a8362ec9f4c15525a9ac7b618f6b60acaae1d
font_01_sfnt_off0001290a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14121 10684 bytes
SHA-256: 30d1a664389f82a64ddcc9924753b366e3498ac1e44a000fd780013bf213e3ea

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