Malicious PDF — malware analysis report

Static analysis result for SHA-256 88a3c0b6759069ca…

MALICIOUS

PDF

74.1 KB Created: 2021-09-08 11:22:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1323dc2b699a46fd98f5ff99e6e58342 SHA-1: b0bdbb6bb2dbe32b3c287a3bbd640db0c67f8498 SHA-256: 88a3c0b6759069ca3bbfcb845dec99898ec70d4f5b42d46fa2878ba36ff8f84d
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 or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to redirect users to malicious content or phishing sites. The embedded JavaScript suggests an attempt to execute code, potentially for further payload delivery or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://moraure.net/js/ckfinder/userfiles/files/robunewivevisavododizupij.pdf In PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c14ee76ee95---pabenajuwupezikuvepi.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/811k3cbjmn7bfd3v8f40aujij9/wuvebevabus.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/limunawulokever.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/46800480073.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/tidigofovomuji.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/528359842.pdfIn PDF document text
    • http://ropesadventure.com/d/files/910565817.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/80311351209.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/10b8a9b82bc2a18ae29949739d2d9680/galakamidutaru.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/71494031143.pdfIn PDF document text
    • http://mahnomenalumni.com/clients/879209/File/36105880012.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/wupobanudunatarod.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607b976c4d961---tesaxaf.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/jivuf.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/15656296370.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/50856793701.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eee6744eed---kidararupalujujamaxe.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095dd28303b3---vususor.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/xedep.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/43934897827.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/29582704193.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/medarasekevuzedolelir.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/wofivefezexupebux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=bikini+body+guide+food+plan+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_off0000bef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEF3 17056 bytes
SHA-256: 5c4fdb18cd8fd25e207a8224336919aa2ee931969c9fc77ff2452bb86ff75493
font_01_sfnt_off0000ea4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4C 10804 bytes
SHA-256: 70f6019381360e09a09bb0977362afc38b0a043ffed1b0f538c8a35b26542be3
font_02_sfnt_off000102e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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