Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f0333eb16093f01…

MALICIOUS

PDF

89.5 KB Created: 2021-06-26 00:43:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 46ef94f2afbd05056c6962eb51e2a907 SHA-1: 5d79a192711d083e4e92bc6ecd9b198c3d5f9e11 SHA-256: 3f0333eb16093f01f056619affbda0e8eba01510f58621cbb8c55ba8e656fb80
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be acting as a link farm to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://infrastone.com/userfiles/files/xiruxukuvuzefeneri.pdf In PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fa09b0fb2---dalesilovovezudawe.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/a899b967422e32a8a398d1a695499137.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ace8d0f347---sixugejamijaxivujeje.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a9ef64280---dezaxufoxowa.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/widefufani.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/l7s83k5j6kbrcad9i1kqvhvko5/mamiloniza.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///motanolipowo.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/2870e6031e81d6ec5d5a1b2989db1f59/7240717311.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed08c105f1---91031862257.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/9ejadt0b22bktibqkqcl269735/31379766099.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/muxewizekekodisilogid.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/1072a402c343ff0e4f2ecf6c59138fad/judenaxoxoxerekuzegudutik.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7a7ed738b---83568104468.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/4c89b5a7f40c5a7d3e943ad8c3c42c9c/46733002877.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c26ff29055b---bakegumozapikefimixovix.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/zarafunuwotulizepobubezod.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/71170394709.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/95273347696.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1ab81a6bc---zijobujisiwezib.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609708180b5e6---mewawunojede.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a95f0f05c75---nasomewapol.pdfIn PDF document text
    • http://cloverpark1959.com/clients/51168/File/92199091712.pdfIn PDF document text
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/90151893078.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a9dee0450---texakoserurugadafevixe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=coughing+up+salty+phlegmPDF 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_off0000fc3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3D 10844 bytes
SHA-256: e420ebe66a987ac0f5f737afc9086390ca686d59ee29d89efef906600c248a99
font_01_sfnt_off00011520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11520 16876 bytes
SHA-256: 3ab81ae01510cd2f8986c7b20628033f1935124555ba5a97fc688754bb0ef49f
font_02_sfnt_off000140f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1