Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fc9e84a242f5983…

MALICIOUS

PDF

83.9 KB Created: 2021-07-31 19:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 301d18cfa6050165874227d3d3cda552 SHA-1: e0b3070d08e52740a70febe691755d6b73d9e79c SHA-256: 0fc9e84a242f59838cb41c100be19742eae0e5de3f69085173cc0d2b2309eff8
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are used to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 6

  • 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://huntic.ru/uplcv?utm_term=how+to+close+ingenuity+bassinet PDF link annotation
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6d6c532b2---wazurawojiselo.pdfIn PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/fexotejanugox.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/kaxakoborigopumiko.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/688e2d22addf215958d9a4229b97c203/nisokozipopejifewe.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16099ece4c747e---74730136166.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/423605c9ee57fe96f2f98c53e06121e8/vopadanaf.pdfIn PDF document text
    • http://web68s.com/upload/files/14901487842.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/79600528767.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3ca869cba133727f710b3e91867385ff/20541785608.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/lumetosaxe.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/d7a917824dae7aafd5ecd2c7ace69a4c/65984569495.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/cmikbuksd78s819usor33iko43/63382595905.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/96894654668.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/6974523357.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/02b5af1377ddca5a6b7ecb0b17274abb/ketonukirujenukatebemum.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/mivumemitiduzi.pdfIn PDF document text
    • http://ranagro.com/files/kofejininimirolapesakaje.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/vasizikibiwa.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202107311029435917.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/mowujutamikelep.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607987ae314aa---46490184455.pdfIn PDF document text
    • http://tykhestudiodesigns.com/clients/7/73/7311521ca682816632878891c231d107/File/79728451635.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1d321f4e4---vigarixasoroga.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606de63cb9e1a---52093225213.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD006 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81D 10736 bytes
SHA-256: dbdbf6818317191c8c2464a627dc8537e7e2e37b6e67a6fb4173792154cb0e3e
font_02_sfnt_off000100f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F4 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_03_sfnt_off00011666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11666 16552 bytes
SHA-256: 75f255b24ba86d7c2dd94859f3ea3b0f66662d2c377681954ff4270c746ece06

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