Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd198a080da0c62e…

MALICIOUS

PDF

88.9 KB Created: 2021-06-29 03:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6fa0a514769cc208097db6c0def6e7fb SHA-1: e6b7f937b72b3cbf824e8b9b19756cf381560f1f SHA-256: fd198a080da0c62ee506424a9a44fbf80d18d4f6b2f4f3ad4c4a6b828f136bc5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM further supports this, identifying the document as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/9b3e96405e4dd31f8cb2b90b77716289/sizubuwozatofokoxufojelod.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fd744308c---26058238054.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086a998c85c4---97752673835.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b8c24ed0b---mudedukubip.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce87de6a75---61342102116.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d35fccecf---63770212029.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/lunah389fa5137bsaaepud5nrq/45516961124.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2303290dd---25113161588.pdf
    • https://universal4shipping.net/userfiles/file/85055678084.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/thbj6766i9kchcp1ne7gde44j5/mupaz.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070ef3aea4b8---dowuzofor.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/trjk8mr8onlrht5lem5set8j14/90722106822.pdf
    • http://kasystemofkarate.com/clients/861259/File/ruwabewaz.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/lkih3rdotf6b3c29gvqalsksg0/26958496850.pdf
    • https://exporoaster.com/app/webroot/files/images/pages/files/lijuwaxomixame.pdf
    • http://www.malagatour.es/ckfinder/userfiles/files/49582159324.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/h0fr91gcs659cuvaqr4ec814e1/31308304180.pdf
    • https://menu2uplus.com/images/file/vuxixiwepobuwujarufu.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/a5b88dd593e5543a9f4b8657ec82914f/27555836597.pdf
    • https://alzubidi.com/userfiles/files/leteriw.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779b6da6f94---rotarubitupez.pdf
    • http://jedwines.com/cmsCart//upload/file/9456543609.pdf
    • http://cropscipublisher.com/files/upfiles/file/96903327203.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=meaning+of+dishonourable
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d387.bin
6549647244d82c43e4e94242b85e9738be9da5a6b06e026d53c051ac370aa5ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD387 18892 bytes
font_01_sfnt_off00010545.bin
5efd8c7537e6c399d7298e7027fe6c91c928d411a21c4844d343702d9d332479		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10545 10768 bytes
font_02_sfnt_off00011db2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB2 16792 bytes
font_03_sfnt_off000135c3.bin
2e2cf0871e0ee73722c999ac1396e73b0839b64a0109fba6844b5fcd6257ad27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135C3 19396 bytes

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