Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0ba1ea07a6441f1…

MALICIOUS

PDF

92.8 KB Created: 2021-06-25 18:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 92b73c18dafcfd30f0b4195913e4887c SHA-1: c3bbacc168db25f179f96527523559c9bf61bd81 SHA-256: a0ba1ea07a6441f10ddf08ecc8ac4ece45997dbf0dc714a0fee33c797fa4c239
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the structure and URL findings are indicative of a phishing lure, likely intended to trick users into downloading a secondary payload or providing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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.
  • 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 https://baohohoanglong.com/userfiles/file/60671691726.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/3m0h08jo5u04hvsivf33c82ojc/24706918817.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/25a81bde4a71737bf207615e7bcf8469/nivojikalik.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/b85614c547502dfb125ca6d5098bda79/72206527352.pdf
    • http://bruisedreedfoundation.org/clients/4/4d/4d9d7eec3bf3a09fa0457ace138f6a4e/File/vabed.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072c64c38534---vezonikovofivux.pdf
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/zixetepibebu.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/327ea7c148fc4c58bcd898a7b9828d68/90293213593.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4d45349ca---45622392685.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/a060b070f946f98dd8807a15c8557094/xizidijudedajefuwum.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608671a7261c3---vezorozotojo.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e2f0c5089---selavutin.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084a22302882---83562245273.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de39d5ca43---25968223022.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/d55171455bde2f0c7146df1d75446bac/vikigavigur.pdf
    • https://licorne-hotel-restaurant.com/userfiles/file/pigawuwabu.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/q16ceqt7i9l0nb7c9c9fo4e0t2/29847648913.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c12b39dc1d0---resenudujixibaribitonop.pdf
    • http://cukiernia-waltar.pl/qcms/userfiles/file/wepoger.pdf
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/555cda9ed0e71dc1759e156afe884e12/woxubokikewoxil.pdf
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/7d74216b38b900fac594b58c654dad11/fafutedisisefajipemo.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/mqbpua5caehgbi6b3j225o3dvc/29124574591.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3e562cc81---nitiwasuwoxajakuvax.pdf
    • http://stroi-sistema.ru/img/nusitedotewalofedozo.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b208548a3---fevuwafobemivuwudemofupik.pdf
    • https://kede.org/userfiles/file/tilimedadekifefizot.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=the+reluctant+heiress+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010935.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10935 16792 bytes
font_01_sfnt_off00012147.bin
b92125a9c108f79dd21d67ce58aa6d72a845572451844b82e33710fc2b9987b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12147 17088 bytes
font_02_sfnt_off00014d7b.bin
dd82d2fb90973493be2ad9602a5485bd3a24e13432050980878e0860f12e1f42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14D7B 10660 bytes

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