Malicious PDF — malware analysis report

Static analysis result for SHA-256 58debb26b656dbda…

MALICIOUS

PDF

90.6 KB Created: 2021-07-26 07:36:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a8bbe42bbd348827105f9ef7a2440d81 SHA-1: 17771d42a80297d04151e82f9a6d3e2f7abedda9 SHA-256: 58debb26b656dbda221bf6eff1f4434691f37c0990c49b7763c3c086231d2dfd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous external URLs, many hosted on compromised or disposable domains. The document body is unreadable, but the presence of multiple PDF link farm heuristics suggests an attempt to obfuscate malicious links or distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://valeneighbors.com/userimages/30884784960.pdf In PDF document text
    • https://searchlink.org/userfiles//file/gusifuvimuluzokonujat.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/34489737880.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/af5f61f18400b561e320dadce57c704c/feniputilelewekotibigotox.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/lujizira.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5beb35a551---kebujozoxelibipa.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/1b03a9e2759cf5509f343b198f4d3d94/zazimazeluzutav.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/21711611876.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/wideganepu.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/84738742453.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/76a944f2891664793fe0917d6afdf60c/fexozoxiredojelumemef.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160813c2ee2cae---43178402498.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/lefewebiw.pdfIn PDF document text
    • http://izdepskifamily.com/clients/1/1a/1adacdf247316bc4617b3617d965acc7/File/81461289648.pdfIn PDF document text
    • http://24cvety.ru/upload/files/jefugisuki.pdfIn PDF document text
    • http://tavio.su/files/file/simikedadodimuzep.pdfIn PDF document text
    • http://protectakoteasia.com/ckfinder/userfiles/files/57373433237.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/gosoporarifedil.pdfIn PDF document text
    • http://fairmonteast1969.com/clients/876766/File/waxugalamopidiwotorirexeg.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/cde8d44087626642cc50bdc4a6f17164/50409255521.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/7313ee9db430bec4d4ff1374b443db1b/tifekozolifuwodo.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/91705774837.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/25593810777.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c779f53a44---73086931926.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=coreldraw+graphics+suite+x4+keygenPDF 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_off0000f102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF102 11396 bytes
SHA-256: faa88623ed5916eb2675d65689e9b3affd3a5291804373b817aef4606c82c8ef
font_01_sfnt_off00010bce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCE 27668 bytes
SHA-256: eaace2f74bf05eb7208323c2a12bbb3e8c879a6344005b328d4e301c490f809b
font_02_sfnt_off0001446a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1446A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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