Malicious PDF — malware analysis report

Static analysis result for SHA-256 996fb6efc2ff2d51…

MALICIOUS

PDF

92.8 KB Created: 2021-06-28 06:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5c16e9d1966e8e80c69d7f422461b977 SHA-1: d2feb82f276c44741353441cc6a957e4161a1bb4 SHA-256: 996fb6efc2ff2d51cfbfc9e5759ccd1b8cfa898e31904edb4a081e04675e55f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c533db375---nitojisusapewo.pdf
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0f4d65d95---57229427827.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084c972db929---paguvamodolubele.pdf
    • http://au-coeur-du-temps.com/userfiles/file/98593940858.pdf
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/posuna.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/di9rq9nic1sv705i70vmua7424/51776904708.pdf
    • http://progfin.pl/userfiles/file/zukuzunedigufomagi.pdf
    • http://v-lukomorie.com/uploader/files/95990345011.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/e395f06782d616c7f254b69ba5af99aa/tajilenuvasabunozinu.pdf
    • http://learnersdigest.org/userfiles/file/gelotijuzelur.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ff0d0a228---69306341478.pdf
    • https://alice-immo.com/userfiles/file/xafutomipiwuliduzumu.pdf
    • http://fashioneducation.ru/userfiles/file/nezunik.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/hfvvlqvikfpvhk051ndjrb9k66/25556751334.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f27b31caf3---pelixakiwa.pdf
    • http://gernano.eu/gfx/userfiles/files/8022286290.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/86d82db6cbc7bc86888bf00010093dc3/zulejerupomabagipitafewi.pdf
    • https://balbok.net/admin/ckfinder/userfiles/files/wowasosezoxowobemuwo.pdf
    • http://internationalnetworksolutions.net/files/20973265361.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/2997cc7e40fd7cb90be2a6a086b42e79/febojijudavunarix.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc7b8adf89---80782820417.pdf
    • https://greenvalleykerala.com/ckfinder/userfiles/files/punirusafesexewilarorideb.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c742117a2e6---29499943435.pdf
    • http://cappellastudio.it/userfiles/files/70025852565.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/21hjkq8gjsetlqvb74h0of81mq/dusobewetozatopub.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=jesus+coming+on+the+clouds+verse
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010978.bin
afed59ba915a56bfb52793998c9abe77eb72e877eed867166359432796eca267
pdf-font-stream PDF embedded font (sfnt) at offset 0x10978 16976 bytes
font_01_sfnt_off00013506.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13506 16792 bytes
font_02_sfnt_off00014d1d.bin
4e647ecaa459193d05908e38be4c49f05cd42917f0e28cd9f9addb4e710b84d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x14D1D 10812 bytes