Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3e048611181cf11…

MALICIOUS

PDF

74.0 KB Created: 2021-06-26 22:31:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8243d65f21d286a9a1de2eddd16f6e39 SHA-1: 07b948015271756475ab2b388d37463e0a6faed4 SHA-256: c3e048611181cf116ec1be1c58ef0b169f3ff5d0252103258d8f397c22af9d91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the nature of the links and the PDF structure suggest it's designed to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e974660e4---wazunuvepefibakawozu.pdf In PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/bfb59a9731f88f38a13655cd8a23343e/7584073815.pdfIn PDF document text
    • https://activepymes.com/pub/file/41063080546.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/1a753f727d7aa583d9afab8895044e98/40835953940.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/d939bf8aaf9653fc1dec91bc1541169e/losenabefotomoji.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966453d5800---dulemepodawokiwevikexo.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094be0c8a497---52749125959.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/30615894374.pdfIn PDF document text
    • http://alexsrmenchion.com/clients/b/bf/bf5401b25fe3457642f5a6f1150d5537/File/nexiraloketexulifawu.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d4805d2da---62354883262.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/lrscpc682ejc41t2o0pee2pb56/zidukiparogixa.pdfIn PDF document text
    • https://airbays.com/userfiles/file/nufomigepamomafurafegova.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/6791199482.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6d38cc350---jivixufilesakozirodapasi.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609de24db5852---41433209354.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/jaxokonimipujaze.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b22f10d1be4---89657473010.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b59c10d4c94---vemexa.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/kabagujitabolat.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/xopekinonoxosafixikip.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/e1d2429ba4a3c968256fa5f88bb413e2/mujofaf.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f681643986---padijapivaxenu.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/a293rr3b9kl0g30du03bbrv26p/67123079435.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=casy+cell+counter+manualPDF 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_off0000bdfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDFA 16572 bytes
SHA-256: ba144014fa4b3ca8eb120a8f09d1251e8fd3b55f355494a0d7ee8977ac57ddce
font_01_sfnt_off0000e932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE932 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10149 10544 bytes
SHA-256: 2f3ad8ec5f85a31066e4290f109d9cc94270e16248cee838ad81981970355f73

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