Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1c3b02c002970a5…

MALICIOUS

PDF

86.0 KB Created: 2021-09-13 21:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a52aa5c0d971c699dfa989e84ebfc448 SHA-1: 81cb884b9e8c72cc4973c2a835cd343d2b4794b1 SHA-256: f1c3b02c002970a5e7cc2afe3ac77c9b16ff5a91748b7989221ccbcc0fcf73d7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious actions within PDFs. The heuristics indicate the JavaScript likely leads to a link farm hosted on compromised WordPress sites, suggesting an attempt to redirect users to phishing or malware distribution sites. The presence of multiple unknown URLs associated with compromised CMS uploads further supports this attack pattern.

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8fe771385---40149253879.pdf In PDF document text
    • http://eclickapps.in/userfiles/files/99027029752.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/ninorekuxilisoma.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139334368990---67300272859.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/66528070269.pdfIn PDF document text
    • http://salt17.com/userfiles/files/mugogo.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/30044250368.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/vimef.pdfIn PDF document text
    • http://irths.com/upload_files/files/terarurasukezuriz.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131dd366ba6d---resukifuzap.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/bexunedusakapenekafofod.pdfIn PDF document text
    • http://boki.hu/editor_up/77432746765.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/lekufevunelulofoniza.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c338f5adba---52748981962.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/fubolureremari.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/11895427037.pdfIn PDF document text
    • http://mrybalko.ru/files/xisamamatukaduzikogaji.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/61926629626.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/velizexuzubemoxiti.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/lakosejizasu.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/5963176318.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/68941370462.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/modimifasimu.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/bagapubazakejibidoj.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/61042725466.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=melhor+jogo+para+android+de+todos+os+temposPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/e9e018833ea10c131e5376a46c710324/xijebowixe.pdfIn PDF document text
    • 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_off0000e2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D8 20456 bytes
SHA-256: b3fdcca5e76be47f1f4b35efdf8db73fd1a30601a5783f250d798b19d1b1625b
font_01_sfnt_off00011714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11714 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F2B 10964 bytes
SHA-256: 512a7aecb4d5bfb6b0e0867421d190606caab9fb7cc4c29bb5e233fa7e02a3b9

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