Malicious PDF — malware analysis report

Static analysis result for SHA-256 d56e2476a26f3d8a…

MALICIOUS

PDF

94.1 KB Created: 2021-08-13 15:21:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cd39af3235c8354ee134c5aa2bfda759 SHA-1: bdd2075b920f6653676624e76efd1e29053bd90f SHA-256: d56e2476a26f3d8a00c0f4dc066ae0297ee441c58e5a96d8ab1662bc1b15fa0b
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload directories. The document body is unreadable, but the presence of numerous links to potentially malicious domains strongly suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818d45eb46f---52969683934.pdf In PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6aef958584582ff974deb1f3f3dfe32e/44251950864.pdfIn PDF document text
    • https://petek.biz/resimler/files/61569712911.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af6e2c327f0---51239447061.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/4brcjpt16meuvlj0i54ielnee6/7080438305.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/pifabasotujuxaworomuzu.pdfIn PDF document text
    • https://ibextrail.com/editor-images/fisagawofowawa.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/64230e77295724979a87eac89f18c7a0/55182755913.pdfIn PDF document text
    • https://waroproject.com/file/24142572398.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/zigopisekirupu.pdfIn PDF document text
    • http://c-six.it/userfiles/files/17671269176.pdfIn PDF document text
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/siziladuwizuwalomode.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/mapatiwopadiroj.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d53fa6be0c---56871636211.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/xunilifumoretawuguw.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/lebebewugatizanubugubi.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2dd65b7d9---rexipeboxuviga.pdfIn PDF document text
    • http://al-farh-iq.com/upload/userfiles/file/57985916439.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///sonefejebukafogakiwe.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/gawakomawajedurorugid.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/fitexoruxejan.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/gogaguzagor.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder//userfiles/files/fumavekem.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/49340422645.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=acapella+dj+freePDF 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_off00010b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8C 10144 bytes
SHA-256: 7ca231bbe577a7c5d47f8a1e342bf727e43876ef212d68e064f5a63fbe1d6f82
font_01_sfnt_off0001225c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A6E 18092 bytes
SHA-256: 171e50529f040daa326bb3de8fbef2bb514fc4f42dc3342a0557448cab9231b8