Malicious PDF — malware analysis report

Static analysis result for SHA-256 610d14ed4ba130f1…

MALICIOUS

PDF

76.0 KB Created: 2021-06-23 22:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 4317e7d4310cc578f9e5448b0642a33f SHA-1: 99049411903a37c91939f8bff97ffce5f5d0a189 SHA-256: 610d14ed4ba130f1fdadc1782c9bd06f11f44e4c39288c51fb7d44b28d27d291
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites. These links likely serve to redirect users to phishing or malware distribution sites, a common tactic for initial access via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfd9bb944c---gadokef.pdf In PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/33b46113242011f95ebad4b9eac5c9ef/pemosuvofojej.pdfIn PDF document text
    • https://bachson.net/upload/file/juvamoguxewo.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8af708353c---vineguxezoliwanejobanut.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160898a70062de---22012657112.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/663f4410532be0aa62b92a265ac99513/bijuwadusaz.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737905b7e8c---bepowepare.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/64880516152.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/48066350bc81fb8c3e0586163b29365a/topuz.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/69fe7f31e9248ee02e4a8706ff5ccfac/32544395082.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/699852e57569118d1e119acbb6b609ac/69026601883.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31106196803.pdfIn PDF document text
    • http://bbu.vn/Images_upload/files/89945177419.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a57e11589d8---vusexusemakimejuwudeka.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/vifiwukarerimavatunorapos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=clash+of+clans+town+hall+level+10+max+upgradesPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78C 5888 bytes
SHA-256: f834dfdc2719d1e71a0d43f3eb12fb7aa9d8e3e941b33f1d91d7d30fe5b049f4
font_01_sfnt_off0000fb8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8B 11468 bytes
SHA-256: e93dc2d8152f50d89873ca883b49a8377729dbaf2b2ff8a65e34f42b493edd19