Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ad64f583f4b843e…

MALICIOUS

PDF

114.6 KB Created: 2021-07-08 10:32:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 62cd0d7928a5210cadc4ec28876f8172 SHA-1: 33c80fc370751da7cc975598790db8967df5218d SHA-256: 0ad64f583f4b843e264da68dc103dce8a3c14ca5da0c8a0424957bca3682b655
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1534 Internal Spearphishing T1204.002 Malicious Link

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it's a link farm on compromised CMS uploads, impersonating Microsoft to lure users into clicking a malicious link. The embedded URLs and the nature of the heuristics strongly suggest a credential phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=tata+communications+share+price+bse.
  • 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://africanresearchcenter.com/userfiles/file/palirixusumunupisegux.pdf In PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160735da3b9656---ludesotiremipekuvib.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa1ce2ae46---36999948738.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160983066762cd---11585597501.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/217375c133b543e61d6fb3efb29504df/rubujokopapakinota.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/f6b42d3e2c5f3c5304693b600667d93c/saketosugomekeratome.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/cdc8e19f35f26a8bf47b9eb605024177/bixulapitudigax.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/95308164336.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/34570882583.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/5ab3e80b0c50f0483d04505aa32a23cc/muwujadixozepajaw.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/0hd0tn47dpbpiu87aiio5042si/zeker.pdfIn PDF document text
    • http://apvn.info/userfiles/file/xudipoda.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b958ca077e3---zirufexorim.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/tosumemupefaf.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/kupasaleduvimesiz.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/774cf1ae8f2730bb8679b942b95ede58/46218222218.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ar08v7ifgtscftu1v2d2p12nq2/botaderepexowijidatoge.pdfIn PDF document text
    • https://norservis.com/files/files/48651500375.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16079de38d5375---pulinevazetibulaja.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/runagokidapafedupimax.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/39469753138.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/21821522522.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=tata+communications+share+price+bsePDF 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_off00015d82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D82 10796 bytes
SHA-256: a90534a7da1bb36d9f4f13d4ef839dedfb077b14b9bb5723bd1d68e13e31d9aa
font_01_sfnt_off000175f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018e0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E0B 17792 bytes
SHA-256: 80fb8e0995436227816c2d2c27b5eca3275e7ded32a86cbb31e78693f394bafe

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