Malicious PDF — malware analysis report

Static analysis result for SHA-256 638ca84e72202dfd…

MALICIOUS

PDF

112.7 KB Created: 2021-05-07 09:33:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 6e4674f38a34702e46aee63e69e7c87c SHA-1: 3c22a2f0ae053edffcde55c71bfe4f6ede62572d SHA-256: 638ca84e72202dfd91f07c9ca349134f1039aeefa5e7e380f93854adeee1de45
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 0.9994

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 http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a65cec1eda---godewufaxojizofe.pdf In PDF document text
    • http://akinmedikal.com/uploads/file/84509705703.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8fee5e425---63194811519.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/9g4tm1tukbluef59bhgk29h115/gejalukale.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608804c9d44bf---39910958244.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/1be466658c6a95f7efeed8662beae69b/84740397459.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/59a52adbceae134b71ae3d827b768b37/79837970092.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/0h30dltji78qdh82fpl4l48jap/jexututod.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/04f3d405c37625e22ef7c5b1d6940315/72393745870.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/6268c3d95bdcd8bfe2f7a75d44bdd988/gulovinede.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/adbdeeac6886949ed2747d4330042bdd/bixaxanoveti.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/vp1mpaoponqpkfetkcstulp84n/bekebedizarilifisiza.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/ouspseupku5eq462uamklo6cl6/67158477839.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606ecc2694945---bomesunos.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd035e37a6---70118183587.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/plmhkfu819bj1ge8i9sh741626/jokomuxasewodabopadiwises.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/9044068185.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=bottom+navigation+bar+library+androidPDF 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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014d75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D75 5316 bytes
SHA-256: eeada8c448ebffecc0ebecfa1cccf8be1bcb4ea6141808b43d68954e6e73d7a6
font_01_sfnt_off00015f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F79 2720 bytes
SHA-256: e613b9ea96af9bca943da5f6268fb0ac404aa0d9542577f634c462211d91e5e6
font_02_sfnt_off00016b37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B37 6148 bytes
SHA-256: 4910d0177da9f60ecc92c13a34fae8c5c38ffafb9e4e22a3c3fd987548b79157
font_03_sfnt_off00017b18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B18 10616 bytes
SHA-256: 502f8881b5bd2c5b0098c60b568b5154d767d626207f460954f59479bd8ed1ff
font_04_sfnt_off00019f23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F23 16184 bytes
SHA-256: 22e7d64dc2c8c088d80156f018a99e28b724eec794b0a6098809cb3b55e1162d