Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6cbe065bf455580…

MALICIOUS

PDF

98.5 KB Created: 2021-06-29 04:42:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 78e945a56169a3026711a88141f54cd2 SHA-1: b1739035886f7960960d6dfa68026f2b649b48a0 SHA-256: c6cbe065bf45558027bfc094d65e47afc277b701140cf94856fe02c5f91a2527
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous embedded URLs that point to compromised WordPress upload directories. These links likely serve as a distribution mechanism for phishing or malware, leveraging compromised infrastructure to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/7cb0179e0afaef79fe133aa553244b69/46887705203.pdf In PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/jgbbmq7siqmsnq25trjeijgobu/66366596604.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/f96e106328db74866cb5dfd89b5b2141/bitozine.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/28ed429eb782b39cb2b70ac6ce71696e/14938766543.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/dafab.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/c5e8421052082b04496917ede1ded7f6/25719491257.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/djbbohvsarnnjm6k6l9v4bg3o2/nakepagijivomawemejosu.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be31487d0ba---49563953668.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16085beb13479e---92991474721.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/61325781704.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/a38c9e3cfae206345f34cb4fa44c7f7a/12263443221.pdfIn PDF document text
    • http://georgefamilyreunion.org/clients/86186/File/7566501684.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/zivelo.pdfIn PDF document text
    • http://dongphuctqueen.com/upload/files/loliranoxebonalekejoger.pdfIn PDF document text
    • http://ha-sine.com/d/files/koruwaresosewetutup.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/45231242251.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/08f6a2783e0bcd65aa109897f00a10e7/tejali.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d8866af014a---gedivakajazigelodapuvab.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/96476997850.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/80736154c8a3acf65fa12e7e597094b3/3748106941.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bcdf743b224---31085324298.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c81b6604fe---59014359812.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/39542768898.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4712dd439---fimujuzovovejabidopixu.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/ca4fa5ab00c1642fc1ab9c57024967c3/79637826060.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608028f09053f---70436596448.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=cow+mating+minecraftPDF 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_off00011b60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B60 18532 bytes
SHA-256: af37c62b81c226ea00517b6be0fd68aa6e59808b04c0608597c36e5ae8ed5b9c
font_01_sfnt_off00014c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000164a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164A3 10580 bytes
SHA-256: c89dc412b7e67ac8a6d880a9c41f897e3ba536ec191835fbb3eeeaf88bf64d7d