Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aca70d3ca99c056…

MALICIOUS

PDF

79.4 KB Created: 2021-09-04 01:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e528f2efbf9583f16ec6ee9b35b10301 SHA-1: 84fbbccb312cea6bb76cb1cc0732c7f105c46db4 SHA-256: 3aca70d3ca99c056ce604de0784ee6d608e729666a2e9293fd21c5c8fd454179
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites, likely to download further malicious content. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a malicious workflow designed to trick users into downloading executables disguised as PDF converters.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://indecomavo.pl/userimg/inc/juniwuvuju.pdf In PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dbcc33f651---biluzeko.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee0a28fff6---zepedavokolikirus.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/o6qac8q6aqop2lkoanefbr07pt/6487473955.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/gumibidixeji.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/908431729c4e15aa421cd2fe99aa6581/31505173406.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bead1992680.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/75758597542.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16077c90f25344---9261901363.pdfIn PDF document text
    • https://grancom.by/upload/docs/jetedanogujuwam.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/damojage.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/80436618706.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/10781856531.pdfIn PDF document text
    • http://konyaozgunmobilya.com/userfiles/file/xazoxoda.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/noritumojafar.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5f32ebf646---32208261037.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ab95a8dc7c0---1526519875.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807a6a33980---nirifokupukutijaxosiradog.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc1a798a2f---magunuzuvegisu.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf3e6619581---80274673369.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/nakini.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc7c8f14e4---42962870175.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=pdf+converter+professional+applicationPDF 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_off0000d238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD238 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4F 10680 bytes
SHA-256: d24521155ec606378f93ca1d1974dfa6cf4dd34141a5546f1931ce170a1d0a37
font_02_sfnt_off000102f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F3 17352 bytes
SHA-256: 50d84e85479761397005586c6e0f7626f90ec5fc303a301d6087603af5813e6f

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