Malicious PDF — malware analysis report

Static analysis result for SHA-256 f51e221f9d17bc01…

MALICIOUS

PDF

78.0 KB Created: 2021-05-29 15:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: d44fc12bb78ba6b8e0f1df3c3e713581 SHA-1: 4ea70b15126460da5f4fc3779647a52309302719 SHA-256: f51e221f9d17bc01b32b4c750d6812561cfbc26b9785c3e7d008d2122170459f
164 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on multiple compromised WordPress sites, suggesting an attempt to distribute malicious files. The presence of a 'download button' heuristic further supports this, indicating a lure for users to click and download. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/al51gdgcmcu287kd3i6o176863/gupuranijikexusopalipago.pdf In PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/b06386f7e38ffabff5df272f494d65b4/5597409575.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/lgfm0sbv5qvfp4i4ugmo4po9r1/73128674085.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098ca6d8b908---tolusikodipe.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/susixojurewezisorepurox.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0c75796ac---40264380758.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608945aded7bd---74888840379.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92071a68f---tirudewineponeneba.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/gu8vdne8pb1e7ig61ua621hmq6/gesolosav.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608893a90b892---36855372427.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986e5cae448---94453250294.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/jf0khr5bo3g5tp351smumnfmnk/ximubalufatunurudisaba.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/7ae88d34defb430428545586d439db40/najapodepapalogufedene.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/a7acd021d03a86ef9c7bd086e943e7f5/wulajopapimesuluzunaji.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/f32261130db43dfff9d0332603a1f893/wifadegevoliwasifo.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9209f08ad---lekusij.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/derepatopamiwawuvonuxuji.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/67689049861.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=amsco+ap+human+geography+answer+key+chapter+10PDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39F 5756 bytes
SHA-256: e5fe90cae9d31b76a56694fabe4571c90c9e2db54deebd79c0e8da175ee4a890
font_01_sfnt_off00010730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10730 10488 bytes
SHA-256: b3556df5ae66c13a51a98323c9a38404901dff18c0f271d9ea39c574d6c92830