Malicious PDF — malware analysis report

Static analysis result for SHA-256 a543329ad9d82629…

MALICIOUS

PDF

75.0 KB Created: 2021-09-09 20:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1a3e808f7e1dafd6e906bf9722324150 SHA-1: 048a02a9810e3234061e366f0a069d40eb0cc7b7 SHA-256: a543329ad9d82629c94c9df8f6cda49c114ef913d5a6f531127a9e1361ad8591
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users. The presence of an IP address literal in a URI further indicates malicious intent, likely to obscure the true destination or host a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://zmiz.hr/userfiles/file/xexubulobubojeka.pdf In PDF document text
    • http://seritour.com/rsm/files/gedibizesof.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/8io9rijg756vapugid8khitcpd/19427301848.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/96811696298.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210908155347479.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f0a9f29a8---litabinij.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/vosegofotefof.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/popibojevewo.pdfIn PDF document text
    • https://hidropomp2008.com/uploads/userfiles/file/losezom.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/dojezito.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/55994951635.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/79548444788.pdfIn PDF document text
    • https://rjpexport.com/files/50490734743.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/kibifiwiwol.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613558d45b677---bubapugewumowewad.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/fosoxudepilepunapugoreg.pdfIn PDF document text
    • https://akemi.ro/hirek/file/kerofiganisejubodilux.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/nukefop.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/tulaluwunidonimitoramu.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/74062628869.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130023118b37---xagefutuzoxavesopemom.pdfPDF link annotation
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161380f28dcffc---371344489.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/sozutifuvexa.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/67883086873.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/93815363851.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=viper4android+flashable+zipPDF 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_off0000c24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC24E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA60 17016 bytes
SHA-256: 2976a3910cdcb664f37ca4aa6a3712d2569110eeae523ed4201348a041c2ee66
font_02_sfnt_off000105fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FE 10744 bytes
SHA-256: b4a17513c304e4d4b0fce36a85babb517e32863988dc8af9644ecdb6937af4e3

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