Malicious PDF — malware analysis report

Static analysis result for SHA-256 d323d902c750d600…

MALICIOUS

PDF

76.6 KB Created: 2021-09-07 00:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a76db7f0d111423ddf0a923a2f196c62 SHA-1: 4af4895ab63e974763fa307bb48f48d630b97982 SHA-256: d323d902c750d600935adb74bc02a74a214c6616671ca94d9efb5f7d19761517
156 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 external PDF files hosted on various domains. Heuristics indicate this is a link farm, with some links pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, so the primary attack vector appears to be social engineering via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pmms-online.com/assets/file/22915355703.pdf In PDF document text
    • http://bisenzia.it/userfiles/files/pilusurix.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/55462827544.pdfIn PDF document text
    • http://lblussana.it/images/file/12261292672.pdfIn PDF document text
    • https://24emk.ru/ckfinder/userfiles/files/2657675736.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/sewifotij.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/608e70ucs679jujb8mm1ud2env/fosokepo.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cacaeec765---norefoxowaw.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16099b4bba69e8---70766085456.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/vn7ov550afgj6ssm3hm7m40kra/fuzakatapamipojuboxu.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/kirosetozek.pdfIn PDF document text
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/94917575859.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/wazixowes.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/kfltg1s7pn4e4ene4mvneocv51/nuwof.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/68414424054.pdfIn PDF document text
    • http://yuli-china.ru/d/files/matuzudupek.pdfIn PDF document text
    • https://artbynela.com/uploads/file/97926777115.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/9e1ef135a45322c6ba482171ec15a434/pafokumi.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/72188939221.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/jewodajajezaputowi.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d369bba0d2---66745844194.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/towiwugimowed.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b730293aad5---regadesikubukob.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16092b18915db4---nokevosidunilegufelupe.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/67949529342.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=torque+unit+conversion+table+pdfPDF 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_off0000c478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC478 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8A 18032 bytes
SHA-256: 94186cab43cc664677a59f8bb6434a348ac1abc06f4892eab89df0f56d381156
font_02_sfnt_off00010ad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD3 11028 bytes
SHA-256: 11b321f1f47662665bfe8f9a75816ace542f9f1921228d18699843b74ef22085

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