Malicious PDF — malware analysis report

Static analysis result for SHA-256 d52b27eefe4ba0a9…

MALICIOUS

PDF

74.9 KB Created: 2021-09-12 18:06:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: ecc92451679348178f1dc51ecf4a6b89 SHA-1: a10d2091fc12e5c82b23c60b6eff59fb3088a829 SHA-256: d52b27eefe4ba0a97e660b86ca3a3b950d6f0b2a50560f1a45fa0b9772e382f1
172 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 8

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cck-brno.cz/ckfinder/userfiles/files/65127161843.pdf In PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/48587033112.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/83945415037.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/dizesakawesexalijuzulube.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/wobalajapevunubisedu.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e43c1a003---4050982571.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/42823736669.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/junapogixulurogom.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/faguwavipevadep.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/59175089427.pdfIn PDF document text
    • https://saptabangunmanunggal.com/indomobils/upload/file/zemonepowagadupinu.pdfIn PDF document text
    • https://cmoretv.com/userfiles/zuvesepela.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/mawimes.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf0a3ae071---rudunijiriduk.pdfIn PDF document text
    • http://autoachtercamper.nl/userfiles/file/zozapo.pdfIn PDF document text
    • https://safetyhanoi.com/userfiles/file/pebowemetufopinafoti.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/sopunoropafinaxekodoxi.pdfIn PDF document text
    • https://123natura.com/stockages/files/dofenitenerur.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16130052079b83---32217223780.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/5d2fa3d9d804635aeccab4d766a924c1/88207572595.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/vonanusa.pdfIn PDF document text
    • http://tzsunup.com/upload/2320014623.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210911133829_4imr5w.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/gj576a6vnhf303v81vlqtlhsl2/84785124007.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/mefifubuvoxidakajasabaz.pdfIn PDF document text
    • http://canoeing.by/pics/files/13483804494.pdfIn PDF document text
    • http://umhouses.com/uploads/files/jigulukizoned.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=constructions+of+deviance+8th+edition+ebookPDF 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_off0000c03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC03B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84D 16652 bytes
SHA-256: 719e8a8cc91e8275dde94afad71196e457d68764c764fb6f8a0893943a915c68
font_02_sfnt_off00010374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10374 11164 bytes
SHA-256: 76f43c25f750cc6c7e52d5091ae984b13b68547ec4a910b31540c8d4b8eb501c

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