Malicious PDF — malware analysis report

Static analysis result for SHA-256 40ad16309f6fd7c2…

MALICIOUS

PDF

89.3 KB Created: 2021-08-21 11:59:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ac13d023abce4b4e43e3ccec85e8e3e4 SHA-1: a30a33cd4ed4b39093498db92f2aea16157bdf9b SHA-256: 40ad16309f6fd7c20bb209b8c70830f19216003667865bd08297af651ab73c48
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. It contains numerous links, many pointing to compromised WordPress upload directories and other suspicious domains, suggesting it's part of a link farm designed to lead users to malicious content. While no scripts were explicitly extracted, the nature of the links and the detection suggests it may exploit PDF vulnerabilities or redirect to pages that do.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://gleneaglehoa.org/images/file/fuvumufop.pdf In PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecceab1424---lalegodukepofugi.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/69447974472.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4c768ccbd---40493295033.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/70295422012.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b092ea4e037---13932019809.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/as40uq80b04q87m6qd5p6g4tki/92393271914.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/2d0ae282434c5b135676989cc658b1cf.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/muwogewiligefi.pdfIn PDF document text
    • http://orderkai.com/uploads/files/7842353277.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b1052dcec---48868841715.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/76c7ae22f2d4f133023ebed9b7035720/xawiteso.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/netukonux.pdfIn PDF document text
    • http://djpress.pl/Image/files/35398076016.pdfIn PDF document text
    • https://aneri12.eu/res/file/rumonujuvusuxak.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/52623d6b41cfc94e61b9d2304a401389/22611954399.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/dafolaroruzatorejali.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/25484560564.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/gumiramufeparizomefezum.pdfIn PDF document text
    • http://teaandtiarasottawa.org/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/nefanezukonut.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/susatere.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/07fa5a70d84423908b1ed984175a68a9/33127807425.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c99aac79d92---sakijobisip.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609322e274a6f---68124943281.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=letra+y+acordes+como+en+el+cielo+miel+san+marcosPDF 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_off0000f4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C2 19672 bytes
SHA-256: 4ed282045de721954ac4aec04d8cca1a518d54f930e471d230bfc9a6bc4534f6
font_01_sfnt_off00012629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12629 10604 bytes
SHA-256: 73f0f3aca18ea52f2add828dd6d7363ea4920946fc2aeb93544303049944efd4
font_02_sfnt_off00013e62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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