Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ead736e5948e7e…

MALICIOUS

PDF

74.7 KB Created: 2021-09-06 22:34:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9fc5187b7c1f5c53a1ae9f3255722fc1 SHA-1: 251f4cf9ffb2abdee765f48f9067a912c230c80d SHA-256: b4ead736e5948e7e6f131d14eb9e7f49d8369cffed44bfde72d3e1473292feb2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised CMS uploads and disposable hosting, with numerous embedded URLs pointing to PDF files. The primary purpose appears to be redirecting users through a chain of links, likely to a phishing page or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080007f63935---xiwabowir.pdf In PDF document text
    • http://konyaozgunmobilya.com/userfiles/file/gogafigibeserenulapezuf.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/9fdbe200af5233d6ccb3ad0e7c84b154/35845632522.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7bdf068da---91566110817.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/83009480554.pdfIn PDF document text
    • https://fratellifurloni.it/file/vokakefugijawanewuzu.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6bdab0861e---dunuwoge.pdfIn PDF document text
    • http://cloverdiamond.com/file/nuxozejafumiwugatob.pdfIn PDF document text
    • http://diacritic.org/travel/app/webroot/img/files/wumekepawa.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/semuvuxekomijerotubum.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/zonapezap.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16093c9c6b3829---20192348689.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/30685462671.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160978fd9630c1---tizeborafariz.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbb8796207---xagitonagikesotebag.pdfIn PDF document text
    • http://azizolace.cz/images/file/71388433764.pdfIn PDF document text
    • http://charlotteellisscholarship.com/clients/a/a5/a56794a54ce3a7e2a8fdc514f00cf952/File/xuvemar.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/19174790171.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/76633481238.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/mewij.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab113ad39c---95911381754.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/javixevabenunejej.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/hgns4f8fdebfjb93h70u1orgmb/laruzoj.pdfIn PDF document text
    • http://accronline.com/userfiles/file/92119907172.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3db922312a---51655271184.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/3dtp176kjv3hadjfd7qvrsmbl4/18834683925.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=convert+docx+to+pdf+npmPDF 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_off0000c21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC21D 16312 bytes
SHA-256: bf89d594960646c71c8b2085f133181ab0a6c71d165f1bb29b89630c520ca0e3
font_01_sfnt_off0000ec7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7F 10512 bytes
SHA-256: 4b61119c8e82d4a3cc348eccab3b5213acc551d9d851257201c8977e4ff9813e
font_02_sfnt_off00010474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10474 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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