Malicious PDF — malware analysis report

Static analysis result for SHA-256 08fde85f875800c9…

MALICIOUS

PDF

87.9 KB Created: 2021-07-07 06:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: a980cbf6cfaa8ce0949a3b702f8125f6 SHA-1: 3a95a9f492eec646661f08178b3602a9470a45b5 SHA-256: 08fde85f875800c9469e32ab1e817be84af9fe4a322fde39b8d6aaf8671af3b2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a link farm hosted on multiple compromised WordPress sites suggests the document is designed to redirect users to potentially harmful content. The heuristics indicate the document is a link farm on disposable hosting, likely for SEO manipulation or to host phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/fad5703b76f226cd2b8e72fc412fd55f/zefilotetomipaberirivodoj.pdf In PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/durusolosupejilolipes.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d7ba09488---70666865723.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b16d1d033e0---48060166902.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160920f0ddaad0---10233868595.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/535169d167ea6ef40c2f3e544658abc5/32196100900.pdfIn PDF document text
    • http://vogiantinhmach.com/media/ftp/file/jewefawebudelifadejoreber.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a2882669b---gugit.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/gowuniveponusizavura.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/46270204421.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///bonetudabi.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783a6123472---zolanefove.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/9c6751cbd9e6f9d6213e4cbcfabf91d0/54778482771.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/84112986663.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfdcbf8b688---ropizazesi.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f2c4864bc---36815961465.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f26787e2c---fozaroremejavarevat.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f81fb8d7bc---gigero.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/si68l40mvo9e7bmqnnqfgcpcna/52771129389.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca02b5aa709---fegexagamupukelujurid.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/79649299946.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/wuxexudewupabenaloj.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b662ee8f0b---rejijakar.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/zibetivititu.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/71639911187.pdfIn PDF document text
    • http://preserveproperties.com/userfiles/files/jorenufa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=good+time+for+a+400+meter+runPDF 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_off0000f35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35D 17808 bytes
SHA-256: ba46751d18b7caf817017a7581a60201ee2da9bbf1b8d2c0b3f20cf35a48b3a1
font_01_sfnt_off00012036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12036 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001384d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1384D 10640 bytes
SHA-256: 6e32b34d9c67d98e2a236a33ed6e5d1a5a211b440e90abbc8d9cdd3d34628faa

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