Malicious PDF — malware analysis report

Static analysis result for SHA-256 94035048d15f992f…

MALICIOUS

PDF

81.8 KB Created: 2021-09-05 15:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c2ac081c088f2b074569af7570ef34b7 SHA-1: 7f5e80fb0a1d9a84f6799faadf0cb91b158c8505 SHA-256: 94035048d15f992f84fa8a8a7ba7a371853790770b964bc21a95152bd7a6b304
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites and appear to be part of a link farm. The ML classifier strongly indicated maliciousness. While no scripts were extracted, the structure and URL distribution suggest an attempt to lure users to potentially malicious content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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 http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffb17e9400---47393244330.pdf In PDF document text
    • http://www.pranabkumar.com/fckimages/file/xaretilamen.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/29b0b07268a71905f86b93c0f65b3dc8/47418117829.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/n3462b8tr6ajahg6u6po7e9rr1/13962366996.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/dd10a4c4ecf299bbbc6b50284603a9bc/kobaka.pdfIn PDF document text
    • http://szwygs.com/upload/zewufutupogodemuza.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/70640677343.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607211642e291---pukakelidipon.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/6a287eeb421e36a1f1be42f164c3f9ca/13951292400.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af66e63da9e---46072900043.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/800b39a231cb53ac197ba9102383843b/livozesasogorex.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210624184321.pdfIn PDF document text
    • http://didula.ru/img/file/gonusevuvosonidaruni.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/g8j0o5nq33c0ht85p4rsdgjid2/mubanudesovit.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd932e3c26---jasafefofolilesokoz.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a250ad1fc52---divaxunu.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/nofulanewevasasadilu.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/gijezeju.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/tutaxelovixesif.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/98199791974.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/06/21/zopuvufaxate.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210713_A7FCE73927F6B4BD.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/62180741434.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/6067706637.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c06b7a65bd1---girumevepuwipa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=converting+decimals+to+fractions+worksheet+grade+7PDF 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_off0000d7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B0 11248 bytes
SHA-256: 8c4e1d64cecb5b3d2d8c4bb50b108195ead1bd2322aafdc95fc40e72a08b7d68
font_01_sfnt_off0000f1d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D6 18288 bytes
SHA-256: 580d248a68ebb86cabdcd1679a055605052d1220cb6c7e2a73903e74605f0507
font_02_sfnt_off000120d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1