Malicious PDF — malware analysis report

Static analysis result for SHA-256 57968fa320420102…

MALICIOUS

PDF

80.6 KB Created: 2021-09-21 02:46:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 103931d52c8799bb3f7f3185e7bb9706 SHA-1: 59d858d3df12ddcf2565f572024686714bc133ef SHA-256: 57968fa3204201026411386f4a1f6b7be08b0570fa414952013f10fa0ba8af25
256 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF document exhibits multiple indicators of malicious intent, including being flagged by an ML classifier and ClamAV. The heuristics indicate it functions as a link farm, potentially leading to compromised WordPress uploads, and specifically lures users into revealing recovery secrets or private keys. This suggests a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://cructi.ru/uplcv?utm_term=best+gboard+alternative PDF link annotation
    • http://kammed.com/userfiles/file/jetuzamosuliwexomepizasa.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/59033973501.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/rekuvawetixed.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/fuxovufajolokod.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/vafipisapamom.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/bafoxiseda.pdfIn PDF document text
    • http://phfamilyrestaurant.com/uploads/files/1634238405.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161383f5bbe33b---kesigufopopupovixo.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f02bc2b76---51849372233.pdfIn PDF document text
    • http://contelex.it/userfiles/files/vazixe.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161487ea7dac74---wefujozubafalosadewamefo.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/25243551893.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/zifub.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202109100907124346.pdfIn PDF document text
    • http://shanghaiqingchen.com/upload/files/videmirovanajusebuvep.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210921071906562.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/sevesezufigefomujutine.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/28730623289.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/r6e42f1vg713l7eemdr2rvu18r/batok.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109201749219979.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/lewukoxedafamabegofozob.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_off0000d705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD705 17536 bytes
SHA-256: 96823329fe88ebdaf4f9b5ce3649f9df0c96a139bd5eb3b7826b9872cc98140f
font_01_sfnt_off000104bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BF 10684 bytes
SHA-256: 331d61b1c51701c87ee98c5426774bfd77644bb7789f70cfe81c7c6039bbff65
font_02_sfnt_off00011d38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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