Malicious PDF — malware analysis report

Static analysis result for SHA-256 56f5108db1d23b47…

MALICIOUS

PDF

86.9 KB Created: 2021-07-13 07:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: fbb9ecd9ed02d3424cd8c9e6f80706a9 SHA-1: 8e6e445b80a4fbf6eb9c71c24ee8711e37c7c70b SHA-256: 56f5108db1d23b473d3678b843eadf6123b00bd5a7c2d2a28c7ee02df9c2872b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous compromised CMS upload directories, a common technique for hosting malicious files. ClamAV detected this as a phishing trojan, and ML classifiers also flagged it as malicious. The embedded URLs suggest an attempt to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.monts.sk/upload_images/file/nemafajoxisubin.pdf In PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/1db767496c92992d8e0854dd0110d6fd/lowiludu.pdfIn PDF document text
    • http://inglewoodreunion.com/clients/68690/File/lagawopo.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a49a1d2eef5---34343983019.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/61785077435.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6e4ad35b9---86766722655.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/t2snfdc5jtd5vs6pspclhjls4p/26997189383.pdfIn PDF document text
    • https://bdcomunicazione.it/file/fesirikawujeb.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b3e1d618e---57181603019.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/wedidomajaripu.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/be83c85037b3a5304779d6f013a64812/rukero.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/mabetepubaselugizur.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/92001814444.pdfIn PDF document text
    • http://luatsutiengtrung.com/app/webroot/uploads/files/72571300859.pdfIn PDF document text
    • http://moje-stranky.eu/userfiles/file/runetikuzogosora.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/13683a0496b46328eefc23c4217fa137/mojebewodatovumirinin.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be551c7e9c---lixifof.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16091a2a553854---43206336557.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/766cfcdcee07bb84303d0ac7ffa195ea/9919726388.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/kozed.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821525b0560---kuxorirofivuretovenos.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607778d5dcc4b---sumevo.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/49627230842.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=ple+past+papers+with+answersPDF 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_off0000f167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF167 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10979 16956 bytes
SHA-256: 8504ce8181966a7594682a2f9ee0d4e9b4da2e6d4ba60670cfe91ad809423f39
font_02_sfnt_off000135c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C2 10316 bytes
SHA-256: 56d3f92afa6d6cfc145db31668a9630cacb8db7c5cfab80bd99a029904004aef

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