Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4f3bbda4d6e2e78…

MALICIOUS

PDF

90.4 KB Created: 2021-09-22 13:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bb4fdaa52b9bae76877915deaebbfe7b SHA-1: e11b2f373bf6b9436609f05a37ed1eb314ec7502 SHA-256: f4f3bbda4d6e2e7892602374b1fc021a8febab04f28725af91aa142bce976c16
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The document contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an intent to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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
  • 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://ezastupitelstvo.sk/editor_uploads/system/files/15324891993.pdf In PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16140af0b5955d---nikasiwilolixamopogevep.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/tikewekewiwofitonoreda.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aac9f4f568---komerisadoratebikaj.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/gekomagaxupoxegovawerage.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/ruranapupus.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/49325106314.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/98261767972.pdfIn PDF document text
    • https://globaltranslation.com/demo/global_translation/beta/userfiles/files/gewogedexapupipekuguzav.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161455ec551c1f---41405253346.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614843cecda9a---68530158565.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/rifuwokizofe.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/vixova.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109080223464828.pdfIn PDF document text
    • http://tzsunup.com/upload/44810893399.pdfIn PDF document text
    • http://luligang.com/ckfinder/userfiles/files/xedowoxizodebilo.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/sukizijanujezosuxawo.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/59261ad7883d0b07b5f94cce4f4d9df9/tufadetapotox.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/kevej.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328763469b8---bafun.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/47092120267.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/vixumotapikolezowebofora.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/kadal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=internal+storage+is+running+low+phone+performancePDF link annotation
    • https://easyown.ddproperty.com/datas/files/42161258843.pdfIn PDF document text
    • 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_off0000fcf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF4 17376 bytes
SHA-256: 500165a034944016501af67cbad7a94c5cf4bde18cfd77d35e8245d99abeed29
font_01_sfnt_off000129b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B8 11064 bytes
SHA-256: 6616bdd189286d7bcb496627054d281bd00de5a9f9a226fcec1130c75f2b189b
font_02_sfnt_off00014361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14361 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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