Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3ff31e21c45762e…

MALICIOUS

PDF

85.3 KB Created: 2021-09-04 23:04:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: be7b0b46ee75cbbbd30cca72f55e67e1 SHA-1: dd13720398845abc3cdd2a6a43f9944ff1e6a97f SHA-256: d3ff31e21c45762e17de1b7d8c51dd4b2e78a8791a38d065e6c9b751b78fe4c4
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is a PDF document flagged by ClamAV as a phishing trojan. Heuristics indicate it contains embedded JavaScript and a link farm pointing to potentially compromised WordPress sites, suggesting it's designed to lure users into downloading malicious content. The presence of invoice-related language further supports its use as a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://droprint.my/home/ququ4923/public_html/userfiles/file/zojod.pdf In PDF document text
    • http://feg.vn/uploads/files/sekeboxemasipikazireke.pdfIn PDF document text
    • https://jamurgoreng.net/contents/files/lemesosedokodisaligod.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/7197924017.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/8uqsim2lfsgkdnlmob7oduclsn/nedugelawavimifusesokoxu.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/ritumekitofemuzi.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/88747747833.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/kefix.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac42a51bc1---mudusudamu.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903ab7a8523---3941468997.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/22762999152.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/62893257217.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/judasapurukojegibibev.pdfIn PDF document text
    • http://itexpertdog.nwoasis.com/upload/files/bofakirib.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/bunov.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/ff1177a6ccb0079dd627f6f4997b5042/62971304458.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/nelufawoxinakukusazidel.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/211612066036.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/koxanegobezopuwidikavenex.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca0730b469---bagesifarodil.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/la9r0p22gob46vem7lgrpibqkb/zizazewobib.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c93ce52c039---bigebojokufusebimefojalel.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/muzizisogelatebigemifise.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/1ccgcojbua7dosnib3bvterk03/97254830209.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/6c1e6c2a44fe86543b9d6c00c9748171/72811672014.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/161078adab342c---buzilusudagixukupuzo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=accrual+accounting+vs+cash+accounting+pdfPDF 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_off0000ea78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA78 16720 bytes
SHA-256: 42932c99dcbc99bae728f84bb9427bfeec192e84bf3099045565027db89a98a7
font_01_sfnt_off000115f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F2 10912 bytes
SHA-256: 45713bd18bb5a8242efab243f321e0a28c1e71b4cffb122dcf7f47da6ab97cce
font_02_sfnt_off00012ef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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