Malicious PDF — malware analysis report

Static analysis result for SHA-256 d55fb0b8281dea40…

MALICIOUS

PDF

92.9 KB Created: 2021-07-22 20:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 63d133dcd1c3dbba43580eb87746011d SHA-1: a0bbf76831479214f1f36b77bfc31c3f15bec910 SHA-256: d55fb0b8281dea40e0676f8c8c2a1ec1af8222e87c9926c83feab00abaa4447c
154 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to multiple websites, some of which are hosted on compromised WordPress installations. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5273

Heuristics 5

  • 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
  • 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://christopherspubandgrille.com/userfiles/files/zerurevamemesesazoriwiseg.pdf In PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/b5b410be545fb393c7f30c3eafcd512b/3009043072.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/42302326222.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d8b286996---55270697782.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/0dd9009e824a11abc7cc8e94d25b0b7b/pabunututitis.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/43070a0e7b9ed05af4a23e369309d258/zegag.pdfIn PDF document text
    • http://cuatudongnhatrang.com/uploads/files/totefuzipikasuv.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd155db6a1---tejewosekuxozodid.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/36520317835.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609308eca529a---pepegiverupu.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/pubowuruwu.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070cc00ea7c9---97230836876.pdfIn PDF document text
    • http://euro-ex.com/images/blog//file/22159820560.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/jaluf.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/b0ec5548ea33468b979279df63868c03/lilodaniwuniritidemotoj.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/169006642960f467ebcd786.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/61058214196.pdfIn PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/32529382266.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74e084e9e1---46730270173.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/d8c1d3a1e987d4974ba0dae260735741/kovap.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/10956934204.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a32954600f---latemituvunibugukanubaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=top+gainers+sharePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011fb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB5 18112 bytes
SHA-256: 0f2388c7d0f6624ddece144533c58e47c1d798332beb461211c0ff3006248e51
font_01_sfnt_off00014fca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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