Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb8896cd0a7de5bc…

MALICIOUS

PDF

95.8 KB Created: 2021-09-01 08:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fa43d2178292eebf760a1023be6f67aa SHA-1: 5c8066c8787234e58d4ad0cdc16c32625529b76a SHA-256: cb8896cd0a7de5bc35fceb899e022551cb1c162a707fd98d33bbbeebd0f12ef1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of embedded JavaScript and a large number of external URIs, many pointing to compromised WordPress sites or disposable hosting, indicates a link farm designed to redirect users. The primary purpose appears to be phishing or distributing further malware via these links.

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://brlairport.com/images/file/kejodilinuxi.pdf In PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/qt21ent5stjc6adbbj9csb5kv7/31700523197.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/fe195b6c7cf0a3771cd65650c6ca83c4/satezikoxog.pdfIn PDF document text
    • http://hubbardfamilycircle.com/clients/62940/File/55456223157.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/rasodukusipomog.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/disarugikarariturez.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/basebilurekumofe.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/82acae9475ceb16b06e2f3e0e2cef691/12920911486.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/zimatopi.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d50ad07899---toxexawasifoxubo.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/49739660457.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/jekevusanivutaba.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/3ak7r78no42d27ivtc8rfkrrll/89129185494.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8373a96e5---79644962134.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/kebexolafizisuvus.pdfIn PDF document text
    • http://shinhwajudan.com/userData/board/file/favilawowudajulonidujuzo.pdfIn PDF document text
    • http://lactopad.com/uploads/files/48701313794.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021042920520273499.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/10976684718.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/gedamirobididexevidad.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/6c495cfa47219daad805e1179340a0fe/pazurigolujebunuxa.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/worisenomedifafef.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c525b8452---45733412513.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd34438c113---nuvosozezebobarogufogi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=sexy+fairy+tail+charactersPDF 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_off00010ef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12703 18508 bytes
SHA-256: 503e042aef600204ffe593cc88ae38427acb7b76d7a7aa439d252a726ef2f2b1
font_02_sfnt_off0001567b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1567B 10500 bytes
SHA-256: 32aa32670f969500906f9fe0bc92c73c341d49fd211c1651f801ecc7a7d859cc

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