Malicious PDF — malware analysis report

Static analysis result for SHA-256 a907cef951c2375e…

MALICIOUS

PDF

125.1 KB Created: 2021-07-26 14:41:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0cbe9cc97294e2a68423a70f7e70394b SHA-1: 71688296da98e15169daa4e4d0c6e2370000363e SHA-256: a907cef951c2375e639c6de814d59ddfb48c4fb5bb2a6686806402977882d5ba
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 ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9894

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://zuche0551.com/upload/file/kudewonugotefotoxabe.pdf In PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/dfu0mfq0or2o50mkns7f2oguh0/38011703862.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f72f4838d8---vumemamevikukozibe.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/vutixeva.pdfIn PDF document text
    • http://dlmberatung.ch/userfiles/files/3196226124.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/9abcc785236f9f623bd7687f28f3b295/lexalomibisos.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae4282ad11---fawenirabu.pdfIn PDF document text
    • http://caigeshi.com/uploadfile/file/2021071412460573499.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d68e87572d---92764932258.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085fcbe6822e---64554052915.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea766c2683---78917113959.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16075c46deedf8---87097591625.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/4687f66476c775dff2a3ef05ca23dff6/11461675521.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/f78bd9704de164f145804359b0d09e01/66901296648.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/44151253587.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/fb46e966f93bbdd67ae0f8966f922f11/gotaxam.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16096f1bfc41ee---44927212173.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/kusemewarexoratimex.pdfIn PDF document text
    • http://1960whs.com/clients/7/73/73384dfd0d582a2861cf356c55c3c578/File/gezanasetiba.pdfIn PDF document text
    • http://liberty67.com/clients/41815/File/zixobawijemaxebosab.pdfIn PDF document text
    • http://ooexperience.be/assets/Image//files/xelobekud.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/325548aba88e6a864ef766f5a30d8214/tuludaretasoxuzitir.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/86820946802.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=one+punch+man+temporada+2+cuantos+capitulosPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E97 20252 bytes
SHA-256: f65c95ad2be3044823f67304cb4655fca7f35bc9e2c9140e68e36e8f189b2c22
font_01_sfnt_off00014296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14296 40416 bytes
SHA-256: e44558829820af3cfa8b12ca4f4d383526efdf3a810d604d3da0bcb7b3725cc9
font_02_sfnt_off0001b2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B2D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001cae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CAE7 11024 bytes
SHA-256: c5710a41bb4485c2b24ca54f982b9b8f9990b0aa2cc33b0e601447a0041aae69

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