Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3752fde3484d77b…

MALICIOUS

PDF

80.7 KB Created: 2021-09-10 16:34:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ba46c44115a10496478560e7bc8aed3d SHA-1: 7db73c0ce9a619f207e58b2548efff1c35d93b02 SHA-256: b3752fde3484d77ba928cd962693252820cb9f12e78e8c028229c66e783b2d24
184 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external links, some pointing to compromised WordPress sites. The 'SE_ENABLE_LURE' heuristic indicates the document likely instructs the user to enable content, a common tactic for macro-based malware. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 8

  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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 http://anhuizpyy.com/upload_fck/file/2021-9-2/20210902075047843275.pdf In PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/14d8456b714d9749691fc7a9d2ccaa5f/pejabokitip.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/sdvkfsofav0knb4bhc0cmmd73q/giremaf.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/medagikezivez.pdfIn PDF document text
    • http://yejida.com/userfiles/file/zisuxemivefugotigobo.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210907220942.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/surozegudoki.pdfIn PDF document text
    • http://namlinhchivietnam.net/userfiles/image/file/54165150542.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/17510160815.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/vigurodisagabajeku.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210901_718EE5D5E84ECAB9.pdfIn PDF document text
    • http://descanso.verareyes.com/ckfinder/userfiles/files/21903809032.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f924b552b1---26000224446.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/72008929939.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/jojagefuzopagi.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/pevixekare.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/d467860ee4499ff72ac2ea7505272a10/80967012983.pdfIn PDF document text
    • http://mfcpavpos.ru/file/vamizetaw.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/78540838193.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/mixunin.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16130dd5d4dcfb---34463527668.pdfIn PDF document text
    • https://implantologie-deva.ro/app/webroot/files/userfiles/files/vuxavowikusem.pdfIn PDF document text
    • http://isvpro.com/custom/files/bibajedutomul.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/nepipakuwatubet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=abp+ad+blocker+for+chromePDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/ec4233e6afd5d82ed16d266bed32fb4e/34641394058.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_off0000d87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87C 17324 bytes
SHA-256: 261986da43285a12e97d8230fa8127215378c489901697e5cd99e7cb25c75440
font_01_sfnt_off00010551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10551 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D68 10636 bytes
SHA-256: 3a344bc1503a004bb81c68ca9200e6659e224e3d0ddaf1445f91ec4b6a45d420

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