Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4e4eb0004c1eb14…

MALICIOUS

PDF

79.6 KB Created: 2021-09-05 02:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4c96c2b7049ba19137d09492dc460abc SHA-1: 7053377cd5423b0f4523c81412b64a67abd7259a SHA-256: b4e4eb0004c1eb14dbc01d97cfb575f3b49dc12bfb91dc0a72a9f0ff13713826
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. The heuristics indicate the presence of embedded JavaScript and a link farm pointing to compromised CMS upload storage, suggesting it's designed to redirect users to malicious sites. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cde8ad3e4---midavuzubugofi.pdf In PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/m2gjulm9p8pa0eltt0u5j9vn10/tuseruvunomubekedawarog.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b197574781d---lonixobudobiwovoriwa.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/58517428974.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9e61ee94c8---38955851673.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/57511043971.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/ripixa.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/7187998596.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/sareronomibizokojokemazur.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/86e9836dcb2a02b35243f69a901b04e6/xijuf.pdfIn PDF document text
    • https://priscar.com/documents/files/kovewaluginek.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/dakolalenawatiwilobagipox.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/runuzaroralaki.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/64p4f7o73hri9e3kfbidfllk6k/vunomojetoletax.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/c6b6ac47d3331b13e053e195cdb316dc/74355808437.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/vojoxigotovululidu.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/79585903863.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/35952475614.pdfIn PDF document text
    • https://rinducm1.com/contents/files/jedapoxanoxof.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/161192e93d3eb1---vomabugusela.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/98767775143.pdfIn PDF document text
    • https://aashianarealty.com/file/zipegugowubo.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/rupabupobasot.pdfIn PDF document text
    • https://gregor-biffiger.ch/userfiles/file/43842687671.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=cuisinart+pressure+cooker+owner%27s+manualPDF 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_off0000d223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD223 17440 bytes
SHA-256: 1d73f7f745e311a3fb7951613e0568ecaeb54413336c129dda8294d1c6da9502
font_01_sfnt_off0000ff09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF09 10876 bytes
SHA-256: f837671d11050ec39ecc2df18d3486ce0de8fb33971c8aa56411a17d861c2dd7
font_02_sfnt_off00011857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11857 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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