Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2af4cdc1a781f94…

MALICIOUS

PDF

79.1 KB Created: 2021-09-02 23:34:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6faf277b482fc5f08298929e5dd7966b SHA-1: 8581320f03256774a3f23c4c665d87ec9a81c4d5 SHA-256: f2af4cdc1a781f9421a724d570077d9b5c4fa6003aeb1bb4e4f1b7faadec89a8
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to lure users to malicious content. The presence of these links indicates an attempt to direct users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://cortemadera.com/wysiwygfiles/file/12498813192.pdf In PDF document text
    • https://akbaturgame.com/calisma2/files/uploads/22235051456.pdfIn PDF document text
    • https://flying-vikings.net/UserFiles/file/domulogumuximosup.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/67995873248.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783d4dd6d95---87978692307.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/52707683891.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/20914377624.pdfIn PDF document text
    • https://people11people.gr/uploads/File/wuzirifex.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802fc225c9b---regofizexumu.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f77f00b35---fuwagadarobafapone.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/karapez.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b33002c02f4---46128844309.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e79722ef1ab---6533410419.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/talazajikududefora.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/fusufafakiwijoxarapawuf.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/7c9d4013921ca9468be724a1237dba87/gabelizuvedetisobererofux.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/54035605104.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/2108011632525910926w12s.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/91442809e6a799ab77d5290d0aa47e9b/deseveviz.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac12a7800a---11617754848.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/26436794038.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed2dd5508d8---mosutagezasedug.pdfIn PDF document text
    • http://recviem.ru/img/upload/76800762515.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/sekibatizunuwup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=albeniz+tango+piano+pdfPDF 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_off0000cc8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8E 19720 bytes
SHA-256: 15d62e2eaf281dd31b8d9043b0f5f13f8f88181c87047053df930c38b3ecf44a
font_01_sfnt_off0000ff81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF81 10588 bytes
SHA-256: 21c2dd2552f6e9363664e0835c7160b07509f3fbe13b18d37bc114baa1b7b089
font_02_sfnt_off00011763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11763 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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