Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bf846892fdc3fb1…

MALICIOUS

PDF

85.9 KB Created: 2021-07-02 12:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2b46db0fc65f6e626e7365847caa04e5 SHA-1: 4b8a13489bcdb6b0823313464341d030096226fc SHA-256: 6bf846892fdc3fb13fd4885d81c3d436733c0e4c39b6def47172c65fc39d63e0
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous links, many pointing to compromised WordPress uploads, suggesting it functions as a link farm or lure to external malicious content. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chcial.ru/uplcv?utm_term=photoshop+apply+gradient+to+text PDF link annotation
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160737416c4178---35102350279.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/90125554916.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/64603773856.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5c2e29257---vorofil.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160976a6176631---10263841304.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/52856018564.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/grtnv7t7hf7dcd8u4idvoa8f1u/58854184691.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/ric7lsgleev6pjtg8a2b3rjsr4/majegi.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/e43a6ce7ff9300ec9ef14502d170ef9d/88946620050.pdfIn PDF document text
    • https://thechoose.it/file/49602678641.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/773b599e7e03df3a7cd1bc104f81fc4f/46535086199.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc4ef34552---mixinupe.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/10426605921.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/64296386011.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087120d9473a---62292313303.pdfIn PDF document text
    • http://chromoink.com/updates/file/wejoxogasez.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/n2p6o83lg4tbd1o5odv5rj4ihi/dajawudazixuvilul.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/qlmoots5kd462278dn5p6d4j36/magemelar.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/aae68493bc8c778999e31443249758f8/47477197322.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf4af6538e---zumovakigaweworenuse.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/h042a1pp6vpqmiaprg0kojduv5/vulazofulexumuzoralulokoz.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c9eebde402c---madaxofobofevaro.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/59f473dbf8b6b40013e5c0dbe6336c3a/bogilir.pdfIn 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://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_off0000ecc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D7 10888 bytes
SHA-256: f04a43ad249526dccfb61056b4b6be33287e8a09522f4f94a77127d1fe2724fb
font_02_sfnt_off00011dd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD2 17040 bytes
SHA-256: 428f96aed0ab64391e8d4dabd52366b36df98c61b3996a9b63f291c33f030693

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