Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd4f3079a2695622…

MALICIOUS

PDF

75.8 KB Created: 2021-09-07 21:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c404955e80e32dd7b7b71988d2ccddc6 SHA-1: 79b342df634840bf60bd5f1892e1c3310ed7ae7b SHA-256: dd4f3079a269562210e978b67b799dea101080017e1ed1d99f5eee3d97b0be6a
156 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a phishing or malware distribution campaign. The PDF structure and link farm indicate an attempt to redirect users to malicious content, likely exploiting a PDF vulnerability or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://laborke.ru/uplcv?utm_term=honeywell+barcode+scanner+ms9540+manual PDF link annotation
    • http://goldartline.ua/userfiles/file/94869106706.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096eb7399f78---76127398566.pdfIn PDF document text
    • https://drsaman.com/files/safaxedo.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/ruvojukutixe.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/84380062809.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/f08e03b9504e423e808b6f695e7af34c/tofavobapenireresa.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f6385a0e8---disujezu.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/9274273686.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608e15e74b20c---mulomalowavanuxe.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d873db21147---towuxujafuwu.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/dakax.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/roxowax.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/238197e53e08913bff6978d944e5dc87/93777499796.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/75241480971.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/ded289b48a1c84c6ea1e8c1867af7cef/vuvegojedozutobaleraxu.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/ad130d5b41be1f893f3f0ba11bf8dfa6/nadakivobulelafupego.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c997dfbeb1c---xoloforetifu.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/37778245487.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/vorakekufarenavuzus.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/raxebiwolasulezavedego.pdfIn PDF document text
    • http://th-hl.com///upload/files/69838558617.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/202166134642579.pdfIn PDF document text
    • http://keigan-productions.com/clients/863431/File/bezuzatiliza.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_off0000bf99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF99 11272 bytes
SHA-256: e100808c0c018d02a85776acd4677d0e7f37c2ed0bf624405ffb8172d7823a75
font_01_sfnt_off0000da2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23F 18864 bytes
SHA-256: 563dc80824dadfc2bda21b5b56cbb87f2987cf7c3e8f3783f44d8b1176fb8da9

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