Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f2eeb9d6a6b1ed6…

MALICIOUS

PDF

89.9 KB Created: 2021-08-24 23:52:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4d90046469c567d015f3db10ae2cedd4 SHA-1: 6f69319504e52c7d0a2010039f188a95960f1202 SHA-256: 5f2eeb9d6a6b1ed64bbbb2a6a635ace78211ce51ffbe7bf5abdb952e586d7363
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm pointing to multiple compromised websites, indicating an attempt to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, suggesting the document is part of a campaign to leverage compromised web infrastructure. No scripts were extracted, but the overall structure and URL findings point to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608170a8cd1a8---fifiweriwodafosisasu.pdf In PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/28805edef64f837d709ae0e7ca614471/sezawowivonupizak.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/04729ec7da395a95ea92ccbbc62abcb0/lusedoz.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/telezudejopinamopa.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ad81f453783---busojib.pdfIn PDF document text
    • http://ashioke.com/images/library/File/45051246718.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/tinidavolivomebiwabibav.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160823f652e35a---55487917067.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077447e1e7aa---muwegi.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/zusuge.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/15568727362.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e23b559405d---83762685353.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/55799165419.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/fewasomo.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c90354d99---xajekiropova.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a4360d23f34---pozovefuboruz.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/df0532c29e3969cd39e87213e4853486/7238461279.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/dogomunow.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5677f37445---4952932704.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/tonokijolasazamawovefogaf.pdfIn PDF document text
    • http://meechoktoolmart.com/user_img/files/xukejin.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/3843623136099bba8d9f51.pdfIn PDF document text
    • http://hubbardfamilycircle.com/clients/62940/File/gepugemuwimamemekolex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=sit+pretty+dog+groomingPDF 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_off000100db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F2 10548 bytes
SHA-256: aa79d8b6c548a77bfb6e2b06dec60ff9d034329aeac1027fe4b7e3b5fe6ade5d
font_02_sfnt_off000130bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130BC 15964 bytes
SHA-256: ed242ccf99ca98970662e3097b8825f903027b9a2d321de3fefd4d5fcc9a6a15

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