Malicious PDF — malware analysis report

Static analysis result for SHA-256 1929028e71db01cf…

MALICIOUS

PDF

72.7 KB Created: 2021-06-28 02:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 33e099971cc9f995199172fd36482c5c SHA-1: 54c89d9c2bc163217a9c35404dea40b7622777ed SHA-256: 1929028e71db01cf1614162246b517e70ba7bf0dbc159d9870a3e6ffb6a1364c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of a link farm hosted on compromised WordPress sites, suggesting the document's purpose is to redirect users to malicious or phishing content. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/5e7f49b9755a4d2ef0a046d2477646f5/9480884396.pdf In PDF document text
    • https://glycocalyx.nl/userfiles/image/file/zijepixosalifenek.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ae6c0d311---75259105040.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711db35c380---kizage.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16091da57208b5---ruvuvavugobafo.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/dogozarofekonubagajifakux.pdfIn PDF document text
    • http://assistance.uz/images/shared/file/30776562287.pdfIn PDF document text
    • http://samafb.org/uploadfilefiles/fasovosiguge.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/dexotazoros.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/vidowefupiwu.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/21135787001.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1606f013214e9d---84412699139.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-25/20210625045851811974.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///21047176945.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1f0b7f5ca---92842543282.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba1488dc88---zojalenisaxodino.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608107fc162bb---jofovoxo.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/755e856b0ffea39aa58b3dc32e6dace9/32265402247.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/d8386a016c31a03b4eb32b67a00edf35/gefoferevevolusubadiworo.pdfIn PDF document text
    • https://educhina.mn/editor/files/69608163833.pdfIn PDF document text
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/werifaruz.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/bexujamudisodokumirovazep.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/j4234j6surn02p4ioahcbi3qhd/girel.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/18861791160.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+install+pdf+in+windows+7PDF 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_off0000ba6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA6D 16716 bytes
SHA-256: 56f9d35aef3bba026c139a6aa682a311a2defe45690a0c4cd31f4c17b3c83bf8
font_01_sfnt_off0000e5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D5 10384 bytes
SHA-256: 09c3e666889059f404f9066c29a44fa2b313a8092c20ce67ec0bbb8da38c47ae
font_02_sfnt_off0000fd7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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