Malicious PDF — malware analysis report

Static analysis result for SHA-256 628b8e3d9c876973…

MALICIOUS

PDF

90.2 KB Created: 2021-07-22 10:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7f93ce79f8ffbe87b859732a6bcbf17b SHA-1: 6a79264d63167a09c276a8151018975a45a1aca3 SHA-256: 628b8e3d9c876973ea1678502cdff2eff143e137cdba7c0381d45efb6b903cd6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised CMS uploads, suggesting a distribution mechanism for further malicious content. The PDF's structure and numerous external links indicate an attempt to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160856d108dbc7---54551532243.pdf In PDF document text
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/vavizarifanifijoxo.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/birakubemidupefukedili.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086929c3ea00---gakepe.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4790dd9a3---zefubas.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92436da5f---50691527056.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/wizadixakivuxobuvimijumug.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/da959918ebb3c3467664da07af3401c2/sodakira.pdfIn PDF document text
    • http://thietbixanh.net/uploads/files/gasapikujamokibabejimale.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/jezowiwo.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/746299a4a51967ca47f5856ca2d941c8/xutedino.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/in50tv4rrdb5slrto7fk4ngsf6/tiwakekuwugofobizoxobe.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/76541837065.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/18174096595.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/veviluwo.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/74943049720.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/bfe244c1d4c3540c523c73ab8b39d41f/zisopekawotijek.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/raridekoruvum.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16098361195676---gizedofigapufiso.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/35058206720.pdfIn PDF document text
    • https://iwistw.com/upload/files/zimogenafazavodinu.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/tovilopexezosulox.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b38b10a79---646266793.pdfIn PDF document text
    • http://hotararicedo.ro/files/files/mexinodetaveb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=cell+potential+nernst+equationPDF 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_off0000fb56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11368 17540 bytes
SHA-256: 89abd2b2fc9cd9ec61c99763a3677cb074bc38ab8ea26e50d954ba135f065e1b
font_02_sfnt_off000141dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141DC 10520 bytes
SHA-256: 8ae925a6b41718bd192986f73bef18ee26240cc7b0867687a2d40c345e057126

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