Malicious PDF — malware analysis report

Static analysis result for SHA-256 aafed2e18d099406…

MALICIOUS

PDF

84.0 KB Created: 2021-09-04 11:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3f346e20394dd781d510d474c2acec1d SHA-1: f44d88a108d15ae6930ed861d1ccc92d94503b35 SHA-256: aafed2e18d099406fa065df7efe8900ed3e1f9d5b2d5179d73b3371fb4a82334
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and other potentially malicious content. The presence of multiple external URIs and a link farm structure suggests an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 https://ontech.vn/images/ckeditor/files/16788414569.pdf In PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/5501f3383c930d2e7bdcdfc01a762217/91787479257.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/23495867342.pdfIn PDF document text
    • http://mfcpavpos.ru/file/17852229783.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/zazixovevoziroxexefopivik.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e7e2d2d09---lumuj.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc343ad472---wajonosaxuvudokosidomagu.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1c5a16783---bopot.pdfIn PDF document text
    • https://dineflon.com//files/remanidomolivedekefobuv.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/xoniruluzom.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-6-27/20210627184449133997.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/55078340127.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/46882690857.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/2t99voh0vhgi2to6henhtfc9a5/vejefamijutidiwenulelatix.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/14026224750.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/zuburu.pdfIn PDF document text
    • https://talenthunt.biz/userfiles/file/wemijimemimivagemun.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/o2mlm7v539o380ig036543oel4/xawenotesororawozuti.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c45b31c2392---87751203966.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/88203f987ce63375ea3fdea3dbe945e9/25567966032.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/78207748016.pdfIn PDF document text
    • http://aa-nusd.jp/gekefozoxonoz.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/svdig99266iej1lg2ormo8nmhl/40090594475.pdfIn PDF document text
    • http://boeschfamilytravels.com/clients/43210/File/71151208920.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/namog.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/wevigidebiwuwesolidifa.pdfIn PDF document text
    • http://jewfri.kr/files/image/files/17441661062.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=protest+petition+format+pdfPDF 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_off0000e1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BC 10612 bytes
SHA-256: 00709f25712d31d3fe581f12e86ebfcf4776fbbc6fb179f057b3d5b7960f110a
font_02_sfnt_off000111f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F5 18644 bytes
SHA-256: 66f4e87e71b84b2907eb9ab61713f01a1abdb4e5d4ea182ba765f483207d8e25

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