Malicious PDF — malware analysis report

Static analysis result for SHA-256 68e113bacfcb3a03…

MALICIOUS

PDF

88.6 KB Created: 2021-06-09 07:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 78850ebd4f979c6d92aeba87d2193fcf SHA-1: 816c31d4343fe1e66b7063e1a2d45d71b3aed075 SHA-256: 68e113bacfcb3a036f55b8b0cfa9fc3aa7df1a09ecc673c08bd356fc0bfea42a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting it functions as a link farm for phishing or malware distribution. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://medvor.ru/uplcv?utm_term=chat+tv+gratis+canal+caracol PDF link annotation
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/nqfj5th2g0u8s44mei4vujia46/61345521727.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/amrd2lnbnfdm7fv46sg7curh8i/vipugevoxerefaf.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/wasigufikeji.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076abe7f24a8---53754565848.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b7696a40e5a---vakuvazumeleremitamugag.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/dobomagewanodusogeseg.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/b87777c49a90a9156a6322d33d3e8a96/wunafisabagapipukomiju.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/88938444437.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/6d6a0667ba75dda5804ac1197bccbad8/29431504482.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdea8828f39---gunuxunowowa.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3ae8d595e---11397426034.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/dadajegil.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/xilozax.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/vk33aq05s38pdsmh30b7uf7jdm/simalamijulojaw.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16083d5e5eaa11---mafegite.pdfIn PDF document text
    • https://evboosters.com/wp-content/plugins/super-forms/uploads/php/files/f68c2e8efd78c08b897e66d15010a5b5/lozoke.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b132351e6b1---89445160564.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8d0d2806c337ccc023ceea7105211fc3/retuwizino.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C50 5024 bytes
SHA-256: 3c152ac75caff3b89030796d8e5e6a967cf6321a6c19ac5a6e747497fe5485bc
font_01_sfnt_off00012d67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D67 11840 bytes
SHA-256: 49e94a101308b355c5ac0abb2c79d53202c79196ece3ca7cf1779b26b15898b5