Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b0074971c19b08e…

MALICIOUS

PDF

83.1 KB Created: 2021-09-16 15:28:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 293226d379a15459a3f791d55ecb07da SHA-1: 29a5b9532d9e9f46d66ce1271debda97e30f1b66 SHA-256: 3b0074971c19b08e7941efe9b2358769e058885e2fc0e1d778a76a43b43d36a8
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 heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely to direct users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/74875441006.pdf In PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/qggivvimgi1qsogda7k62u8r74/50081959979.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/gozesilefokizesexina.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/19278142458.pdfIn PDF document text
    • http://sbairs.com/datas/files/nidowiwizagobegi.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/95617197539.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/13346770634.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/bodorufinavegam.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/58016267134.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/18730084177.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/35113300461.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/75612986860.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161331b1b8e4aa---vadugulolelawilax.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/44676540778.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/kegakopuzotukive.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/ledegafakakekij.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eded825f18---98393613394.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/41449853055.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba8746806e---43673262764.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/gijilebanimulebifabelelaw.pdfIn PDF document text
    • https://www.nitdgp.ac.in/uploads/userfiles/files/zajinilofafu.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/pezuvubupepumanok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=bundlerelease+react+nativePDF 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_off0000ddf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF9 18872 bytes
SHA-256: 05c28f4f8add77ae2f66f7a19e9cae1d32c881bd4b51fb05aaae1f9128d2d0ec
font_01_sfnt_off00010f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5F 10460 bytes
SHA-256: 8bec1191b615d08e03f50ae0847ad0b31ccd5aaeb0c67eb56b591b34fc259667
font_02_sfnt_off00012745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12745 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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