Malicious PDF — malware analysis report

Static analysis result for SHA-256 4402a388c15f08b1…

MALICIOUS

PDF

94.7 KB Created: 2021-08-12 15:12:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2093176e9ec9a83248ff194a8805b80c SHA-1: 58086d2104862618316c1a266164eeacae19639a SHA-256: 4402a388c15f08b15938d490b2e31df555eec8a8882ea51e83b02e0c7903ee4f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host malicious files. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to download an archive and provides a password, a common tactic to bypass gateway scanning. While no scripts were directly extracted, the presence of external URIs and the ML classifier's high confidence score suggest a malicious intent to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608be1db144e2---mibifuzanomaxesugune.pdf In PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160c78289f2650---zogejumetulolizoperejaw.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/cf50a109c1d63d2b1928976b1cb87ba5/ledilofetixaforadij.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eedde01fde---kimilodapufezelexumofi.pdfIn PDF document text
    • http://schs1968.com/clients/861610/File/96037988720.pdfIn PDF document text
    • http://liffeyartefacts.com/fckimagefile/file/67054113500.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/pakurugenixelalerevidub.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/03jn6chbvbiobs3uem4n7fi0t7/posasogavifasuruwuv.pdfIn PDF document text
    • http://0851gay.org/userfiles/202107file/2021073001235870554.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/99203103721.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/77237908505.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/pimewijafamemuror.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/13416272710.pdfIn PDF document text
    • http://soflocops.org/clients/83264/File/mazot.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/d73402a9a743296c01ee4978487999e4/popuwujimulur.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/46286450849.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1627792320_48bd12387d.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/10196891986.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/tubepobanekowiwavefid.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/de7b8a190321205a4a27fb47f18f231e/gapogomivo.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077dea16e436---53517007681.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/1beecf205788b4623a47484c66a844e4/junekakaxovugovajiv.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/u7bpj5fmkcic8n0smeqf4lgpvp/51042249587.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/ebcdc252f5842c86a7c381f2a7be0707/jiduwepufibipamosot.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/99941225435.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/74832815483.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=codigos+de+roblox+para+ganar+robux+gratisPDF 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_off000109e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000121f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F8 18224 bytes
SHA-256: 203a5f6d3d33a70b24dae255434d0178709e49795fd94136af3a55c0224b365a
font_02_sfnt_off00015092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15092 10940 bytes
SHA-256: 7772812268e5909b4457cb93ee8a4a5083f8bfea26595a8a6e053f7dd5bedf2e

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