Malicious PDF — malware analysis report

Static analysis result for SHA-256 160b6319b84a3cd1…

MALICIOUS

PDF

85.8 KB Created: 2021-07-27 17:15:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 934e2367b0855316d28ad78bb2f476d5 SHA-1: daa948692952a5ebba15da30215d263a15376bf4 SHA-256: 160b6319b84a3cd151fcdea8aab9e08f388158df44fa4563b98ba038ff2c507f
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://j-line.ca/fck_upload/file/mubow.pdf In PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/8101ccf1b0c180e95f05d22b22b3cfdc/94235246401.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9e7c4e402---69526901200.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb23295287---21914992442.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb426ed8f7e---lupokuvumegixurujedirodug.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/733e0d7799347cecd2e36ee89d6091c7/revoduzarexoj.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/q3fscjg5ev7ip07nmc8mfchsfj/daxezipoxomajov.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/bapopibo.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe4b4b47ad---40450971958.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/d590d3d8e240142840218527d717fa33/digil.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/8c457a2b3c65454ab9014a9c74a719cc/wofetavevipuduz.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/325eb475ed89487644518a785162192d/45289632313.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e55f249be32---73425154423.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/mamafuz.pdfIn PDF document text
    • http://mrsinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/suludu.pdfIn PDF document text
    • https://italvaping.com/file/gozorojupunuvine.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/9962366796.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/zuzuvavegadanokunep.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/magazovobowojojizunaxepa.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e36235959a---61915781502.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/90770082731.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/39424949922.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/mozalegize.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=descargar+pelicula+el+gran+milagro+latino+megaPDF 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_off0000e5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0E 18604 bytes
SHA-256: e3c7d86f5138bf9aed37ef7704b3fb8aa1992528e9ed94932f82d56d204640f0
font_02_sfnt_off00012d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D71 10816 bytes
SHA-256: 96ae21f0ebf08dc459a85f9c1a1de67fdbad39fbf26c5d6d0f5a4bee099d30ba

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