Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f1d3c88fac2c409…

MALICIOUS

PDF

81.1 KB Created: 2021-09-01 00:23:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 38d6be5e67b1752e29620c93b54f4412 SHA-1: c1650448edcafbb4120714f294ada6b7cff597e0 SHA-256: 3f1d3c88fac2c409aa9deb507a00ec413db035ef1f0d47dc173d8146cc88f9dc
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, with the file being identified as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pistant.ru/uplcv?utm_term=stereochemistry+and+chirality PDF link annotation
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/13mpuuk6n7df5a34soktui5eht/13829247677.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/jokej.pdfIn PDF document text
    • http://acril.ru/ufiles/files/rejibekudoweri.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817af36b822---83827057.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/62617712002.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/f2205f530791c5234d13181fcf9a9c34/11899369098.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/97291563910.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ba09bce2f---88399639294.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/2425b67428843288a3976d1c2824415b/77076803419.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/lutubanisezapeserosot.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/0ho04hgachegbebhgv91oi9b5q/49528678106.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/bubodev.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607126a505278---kigutinajibadux.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b63577b4220---28702086143.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/28110769e59228f4544788de5c5924a0/22778022392.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/92343750116.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/6oturdaai3gp2l6o6ecflnlgh2/xesetovubodunis.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/066c59074da3adfe3dd0d462c77705db/59316095451.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/lexagu.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/vupoxanibekebitidiped.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/jorebinelopomireni.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/surojizititi.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/fenozoxorarivima.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_off0000d6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E7 18128 bytes
SHA-256: aefda62dd45c203f149158e460c5beb2581f592b649d544f3bf69d20230318f2
font_01_sfnt_off00010612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10612 10824 bytes
SHA-256: 423a503faf2d8af771d5485128a6e8890f78ee26971f8da929a2711345749642
font_02_sfnt_off00011ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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