Malicious PDF — malware analysis report

Static analysis result for SHA-256 926f4f77915da320…

MALICIOUS

PDF

95.1 KB Created: 2021-06-10 05:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: b74d7db3876e0baaf9eeb23327391b46 SHA-1: 13cb1327101fec3dd0bbc1aa291a67e1c875cbcc SHA-256: 926f4f77915da3207e4e6eaae14eb2224c203c2d354697b6dd391b6afaf7eeca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs pointing to compromised WordPress sites and other domains, suggesting it is used as a link farm for phishing or malware distribution. The presence of `utm_term` parameters in some URLs further supports a phishing or SEO-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://synerhu.ru/uplcv?utm_term=labour+act+zimbabwe+pdf PDF link annotation
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16086a829ab75f---popalisosojuvamevi.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16095bddbbde1d---gikuwivifo.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/rih38j2nhce5ouka887ujvcj89/zulizupuverudofulijib.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608daca03338a---73195543762.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/d3dcd051ec52fdfecc464565d7e9d964/dajobogarakogevuwuv.pdfIn PDF document text
    • http://citra.cl/userfiles/file/werujeruvujewurijepizamos.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/3a2f6d9776a444b3a234471b9a1e49f7/36829795505.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/brkkioubh0ttfq7trps7gj56q7/kuputezexabofukuwiminu.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/84198945627.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/893a24dul35memjnrc0h78v2au/44275859473.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076ad7dd1909---2257437308.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160739613b2c26---vujupepev.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/divovutogotulijujesogaxij.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/2931db4d88387e0b78f25fa119a611b5/71571686656.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/manororowiv.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/88531920292.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c832a7a869---tutulo.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/7369abba5aa011341195f7f7eec1d5fa/temevefumusilajebixefupi.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/48a2eea7110b1e7fb553f7a1229f565e/96208998975.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13729 5316 bytes
SHA-256: 52ef0e67d6bed44d6b1df19dae547101de69b72d63db2f62fe2a621cda007f63
font_01_sfnt_off0001493e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1493E 10716 bytes
SHA-256: 35645cc88a2754105f7ebe6432bd69878c2df32e39b6bdd2f782950e345cf6ab

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