Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8f7eb8e98789467…

MALICIOUS

PDF

69.9 KB Created: 2021-09-01 11:32:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1d83446aeb9afe4bb2b89365479c95e1 SHA-1: 165c60ea186896c5986d717f0d13db575e47f9cb SHA-256: e8f7eb8e9878946733e1b4f5bf125b4b6bd1183443e1032af0ede7cc01a2237a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting. This suggests the document is likely part of a phishing or redirection campaign, aiming to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • 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 https://amatnieks.com/pictures/image/73850052703.pdf In PDF document text
    • http://allycatering.com/userfiles/megagariwitefakudofipaxef.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7ce79032e---15578147808.pdfIn PDF document text
    • http://wami.cc/data/files/zusukorevewejekekuf.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/voxovevaguzamaweguniveto.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccf29ec5e5---93615218449.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/13613240102.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607314f76b5c0---tubanaxonesopadisen.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/xuwukoxuv.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/04d5faef89710d03027d9090bcaa5fa9/lunuzobubiwiwezatokuxanek.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/po7i74nrsv10qbk6lue1h8u7g7/11909403719.pdfIn PDF document text
    • https://kraftyz.in/ckfinder/userfiles/files/67276458803.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/12708608517.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zepim.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/76d058ngitv68c3j5mleq4ajpk/mujipuwis.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/pufijusurezek.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609c30cd3347b---29285746942.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6c130372b2da1d87aa28a65de18bd44d/wuvapopumusu.pdfIn PDF document text
    • https://x-software.cz/data/file/74035706654.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d897f18d5a---76397633461.pdfIn PDF document text
    • http://riasztoszolnok.hu/admin/fck_upload/file/dinasoban.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/533f730d0b1a46ba1f3b066f4f65c03d/lenokanazojiwekakutogiril.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/zezadomufa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+many+is+one+clove+of+garlicPDF 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_off0000b2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E9 10840 bytes
SHA-256: 302b52b6055e61d02a0092d118b5f22a30417a48f4095b3993344b6f2f8647a6
font_01_sfnt_off0000cbf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF0 15144 bytes
SHA-256: c404b0c29402b1958c743c56e1a0f5786f9aa000bdbdf3138c301a8c2dac4515
font_02_sfnt_off0000f257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF257 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1