Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d3ad8d297beea54…

MALICIOUS

PDF

98.9 KB Created: 2021-06-28 20:23:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 61385b8e45d469f00a9fb3cf1abe7e97 SHA-1: 517c93956ab6fff9b976eb39784ff2ffd3120c7e SHA-256: 3d3ad8d297beea54f148c9ae28f90f29a3c6ac89eeffa8a77ced46bc7f2e5c3c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to multiple distinct hosts, many of which are associated with compromised CMS uploads or disposable hosting. The embedded URLs suggest an attempt to redirect users to potentially harmful content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 https://emmaushuis.org/pages/varupizufa.pdf In PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/9c7cb85aafcfcd85fbba752f2b08491e/xasubogibar.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/h5jafbkftksvu2gd76kvoimm87/lijilufotimefepoza.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/kuvuful.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/kuvokinutaragezijaveri.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/bh5h3qnfgku48l8n6gadpcm64k/juretaravapar.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9aeec7176---18085528881.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/bazugifipagujawakevikij.pdfIn PDF document text
    • http://araonline.hu/uploads/file/fakugopufovimegu.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/93153831365.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832099de10b---sunebitabevemuwilima.pdfIn PDF document text
    • http://sillajen.com/fckeditor/_upload/file/30800076602.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/1e14c57fd8c6c5d9f2ba2690faf97e59/xavobugawe.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/hd1r607h0f66j10gds2h76t8g4/26395348164.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/domoveg.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///22646067228.pdfIn PDF document text
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/67243071428.pdfIn PDF document text
    • http://skncn.com/u/files/lozogubifod.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/wijafowakedefumiseme.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/6f04d5e7a28c586cd88485d078615004/5626084662.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/44b42bac46fbc2eab24de5a8528c181f/sewiguxaxovewusaru.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b73dd60324c---wozutipaterikamisoraxu.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/a68013d7a1ed4e37fa350e3c0d07e009/nawovelakexomejasovove.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/64bc15e6fac90ed77ccd0d207409e440/77930719765.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/b94283d91cfab87ac34cc6591fa6d6bd/3883474118.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=graphing+compound+inequalities+on+a+number+line+calculatorPDF 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_off000117a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012fb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB4 18896 bytes
SHA-256: 8c8f2ed589d76bbeabbdfa6f92edaab3d8d090d1c6653652d44fd8a56248b477
font_02_sfnt_off000161ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161ED 11384 bytes
SHA-256: b0f848222db2335ca54ef8a71164f0d1d94d0bb6bb50f6008607181ee80a2e8a

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