Malicious PDF — malware analysis report

Static analysis result for SHA-256 d58cc7d92ef426b6…

MALICIOUS

PDF

78.3 KB Created: 2021-09-07 15:35:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1e630a8a5170b1a5effbcb7111199874 SHA-1: db336a691cc0badfe7a0e3f2c0b321ec4bcd3a05 SHA-256: d58cc7d92ef426b605e31c00307496c031cf2fcd96c95bdf71853d6dc81d164e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. The presence of numerous external URIs, many pointing to compromised CMS uploads and disposable hosting, strongly suggests a phishing or malware distribution campaign. The ClamAV detection and ML classifier further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://queure.ru/uplcv?utm_term=honda+cvcc+engine+pdf PDF link annotation
    • https://annjulieskarpmo.com/userfiles/file/56117179708.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096573c28cff---56161038025.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/zavetafarozozesukovomova.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/gogajejimuxeleledizesum.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/9601384191.pdfIn PDF document text
    • http://insk.ru/img/userfiles/file/59229577800.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/192ujda6l5lr6u84iqcr3o7k67/17530896511.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/31355017961.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e299995e1a---zejijaneg.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/kibaxagorewamubo.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/65063191603.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/bogigoxur.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/dololejujerelupesozak.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091da61ba364---42868122296.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/fv8uucsb4of8jp2n9hnlr8tm36/kufodowabazak.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/208f7a89e216059d4921e0e8b36508a8/xaxetegikaligem.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/mifopiwimekof.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b55b3ff66---jawamidiwudedidetunuda.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf35e3ee32---48491792820.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/sugimojodojo.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ca0f04b93398489df438bdbf9efbd547/mujiwumovifip.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021082800205073499.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/dv56i30mdseqnd34nmbsfh9tq2/gezitoxijunibezigak.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/33800932245.pdfIn PDF document text
    • http://nctpa.biz/clients/5/51/51e593b678cc4707ea5ff7b662bcbdb9/File/lurubemun.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA62 10440 bytes
SHA-256: 9d349da052cdd2afe37c187186eee7843c6a29cf23ef7c9d550512eeb00b2d44
font_01_sfnt_off0000e1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EB 19232 bytes
SHA-256: bfcdf19488e4f3b594f9ba61f4993211738496cca56e235e4568ac0505489b7b
font_02_sfnt_off0001137b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1