Malicious PDF — malware analysis report

Static analysis result for SHA-256 44dd5d8df4bdca6f…

MALICIOUS

PDF

115.4 KB Created: 2021-06-21 11:19:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: cfd9b2bcf03112d95dada12167a7a8aa SHA-1: 3fffe07b04aa1efa96479790ce4d2d10d1cfacd1 SHA-256: 44dd5d8df4bdca6f5b1d6554b8c2c1e62ea4d9a8a8c20fa18eb4a242dba6a514
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

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://queure.ru/uplcv?utm_term=eq+emotional+quotient+test PDF link annotation
    • https://wickedcheesy.com/images/file/burigenigadegumanulebuwap.pdfIn PDF document text
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/75460401562.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/50056727652.pdfIn PDF document text
    • http://ghemassagenhatban.vn/Images_upload/files/49476778053.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/4131581260.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/74ed5f145a8eec2b9435c040f152d7fc/34638964221.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d5dacb173---nivupamesusuzodogor.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160976c940a8bc---zemuruxomimaneluvexoxam.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/14173748908.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/b053c69bd9d950fc735cba6182f5f1b1/60440672440.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c09ff97a8c0---bogizusataropubanomawe.pdfIn PDF document text
    • http://happy-travel089.com/CKEdit/upload/files/limivolaragaxu.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16083c6fcf3e95---58585982222.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757a42b54fa---4101474916.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607297d712452---juxumoridejeweved.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/3e2c9ee6d13fc8adfe0b410ca6012c88/tunotejopilegivogonu.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/38425607770.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/65080203043.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_off0001893b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1893B 4816 bytes
SHA-256: b87a8c48bc55a16692298e095fd6cfbc40cb9358ae3c8ed7bdecf9b3115de181
font_01_sfnt_off0001998e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1998E 11684 bytes
SHA-256: b821117bad3b1d397f2546cc5e503bca10bd552c053cf7c37f16c1c9e44f7186