Malicious PDF — malware analysis report

Static analysis result for SHA-256 b164e8cc8557cc5d…

MALICIOUS

PDF

83.4 KB Created: 2021-09-10 05:22:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a7388f1136af7ef64544f8819c1d5bf5 SHA-1: 5969ac008d80ddd21f23a93acd74ea367fc2853c SHA-256: b164e8cc8557cc5d2d9785ac3563c8be61334cbdbf9349b1a968b6cb6a21a810
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also functions as a link farm, directing users to multiple external URLs hosted on potentially compromised WordPress sites, suggesting an attempt to lure users to malicious content. The presence of JavaScript indicates a likely intent to execute further malicious actions upon opening the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://garglob.ru/uplcv?utm_term=spider+man+2+android PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdcf3668ee---wuwojetaxulaj.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/golusajom.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/90336179187.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/muje2ph7ro7arjquh0g50enf2s/52146622902.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/64091740579.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/volepadadowuwiketipimodi.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/40340189590.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161350d2971823---32338602578.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/zapatodijitisijodaxixog.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/fanijakezewufavaxuwexarug.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/78366936770.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/41752985249.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/dofutopedoxadugim.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/sudaxoz.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f79543cb88---viwabofonuguzotujur.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/003fca3a801a01ded047f6b3b136ae87/14644611609.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/kapitopatupezodix.pdfIn PDF document text
    • https://basisnomor.com/contents/files/nitidaf.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/38780595400.pdfIn PDF document text
    • https://hometutorsdelhi.com/userfiles/files/87298878382.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/vibajijaxobulaxotagop.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161322d619ea06---rukix.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/sijulebinu.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_off0000e2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F7 17632 bytes
SHA-256: aea0e6c8622a8a5d0c336ce9052527d753c18761415f576840036630bc8ef330
font_01_sfnt_off000110c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D8 10436 bytes
SHA-256: 57e3c042f84a0000a243201587d26855980a69bdb8d7e7e328c84c227a35ee6a