Malicious PDF — malware analysis report

Static analysis result for SHA-256 a518b704678251fd…

MALICIOUS

PDF

85.7 KB Created: 2021-06-28 03:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 93d09bb16c9ceb9810ee5f6e945b6e7d SHA-1: 6e80862a9b7c54c1879ea3af3d33a31131048e2c SHA-256: a518b704678251fdb5dbc4fbd7aad221598d1fe28114343558a26b540814ee02
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 multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/df3c3475ad489c0a20d5b099d11a821f/bigid.pdf In PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/109e79f63684a069bdf05db15d168552/xazugirujitarujikid.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/452684ac7ae86e49417a36a8dbfa00ad/talunumofofibikiwobuwob.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/xawesaturoj.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/95bc51f130be66b24f2ddab5f05af5af/72381099708.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/27656546963.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/gfpm7b8u04mk0qdtqoii436ebs/tinoluvem.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bc928896905---88533276864.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ebbb0d6e9---nijudofasetidovaxapi.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160d016733ad7b---susuwafudedesa.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/60532947770.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/ac8dccb923bf5ae1a9ccb8b0bcec08fa/80832960331.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffa6557555---togobizu.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ae0fd862a---suwizusen.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7adee26a6---37557363225.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-2/20210502070253824875.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/58425356561.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806e4d5a22c---89861646638.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/caee1f447a4c330c5d82fbbf64c7382d/38811255333.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608062bddad85---zivumivosunuta.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078dc7ab2e4b---nefisijezevowam.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c403be273e4---rimamiguf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=tvr+tuscan+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_off0000e7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCB 10176 bytes
SHA-256: 4008aa55c9b4de1f01be96cc278910282726d6a00a94bd7af21f35767da8a84c
font_02_sfnt_off0001169a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1169A 19900 bytes
SHA-256: 2c0a4fd946b0bc20eaa93082a0e93ef825a852efc4c154d946659b9b2bae23dc