Malicious PDF — malware analysis report

Static analysis result for SHA-256 785606aac963c146…

MALICIOUS

PDF

84.8 KB Created: 2021-09-12 16:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f67434eef8b51dcc36ef0f812ad767b8 SHA-1: 58c1d4c9a9577a0f51be047655c79a922ab2509c SHA-256: 785606aac963c1467dfa5d68a14c47d1b90e1461efd613a3f3ae1c65dc159195
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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.
  • 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 http://immobilieninvestors.de/userfiles/file/sagapugisasin.pdf In PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613226e78b40e---wiluven.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/wesobebi.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/wopinamabativenalakudefuk.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/38184662215.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d33120925---pesabo.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/97471951641.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/81665318416.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/nidewedurominogoboxaxirum.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/2af3e9a7479a6b482bde445dfd40e64d/76288391470.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/sesakatosenukenevirarebo.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/xemesizezuxodusogiw.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/11504260457.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133cb29acdab---3185463983.pdfIn PDF document text
    • http://kitpaisal.com/mypicture/file/40994047429.pdfIn PDF document text
    • http://bajkolandia-leszno.pl/userfiles/file/62184764544.pdfIn PDF document text
    • http://shopabrang.com/images/files/63511644781.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/sirivapinomi.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/rimilarafiximirorujiri.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135d63fdb833---kidekokunu.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/970j7tnsf5jh95u2nr6skkj1tf/wugavasedo.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210904190416.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/36691504057.pdfIn PDF document text
    • https://ppntassone.it/dati/upload/file/jikijimodozeri.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/43984463056.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/disenifizarok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=download+one+piece+pirate+warriors+3+androidPDF 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_off0000dea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BC 10764 bytes
SHA-256: c8f850f97b7c5ed99f45b2c24f9c8dd2ab116a9722ae3bd8e264c5852e617698
font_02_sfnt_off00010fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA8 20352 bytes
SHA-256: 8b57c3fcae872687dc73ffbaefc19f4ad3b5ac7952e8dd47b63a06fa5ee4f175

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