Malicious PDF — malware analysis report

Static analysis result for SHA-256 fefdce0d0328abc1…

MALICIOUS

PDF

82.2 KB Created: 2021-09-08 07:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1ff233ad6a516ebba27ee5bad466797d SHA-1: e6895cb1c397cd5ceff9a8092e0f143742520cbc SHA-256: fefdce0d0328abc13384bce3db9fcb6835d5309de145bac547fd0d8306dce3ac
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable hosting domains. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://transbur.ru/admin/ckfinder/userfiles/files/debunusilorowojuniwipimas.pdf In PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f83c91ef0e---gabaledituvin.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/kiwobutafatexefekuzuguri.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/9365411002.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093a6337ae30---zukej.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/81495375847.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbd8fcb2a0a---makakemukulidizexorojaz.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/peruvubamopejezaroxipix.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/lamupav.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/nodadi.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/buratedere.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/59f96168403494ccb889286bb2f27eda/dixavirenenesajapikof.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160825cb3eac29---83413196500.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1608304b51c4da---jukewebivafabofekaf.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/gitorizez.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/4ba541a7a3736c81d86432c396ddfdb6/61320977163.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/466e65fbb24e4daca4265f3d9a397654/batededufisapiralizado.pdfIn PDF document text
    • http://reflita.lt/uploads/files/mizavikig.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/79926584315.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/ledakefokegipefepuwarasil.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/3474541070.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b535910592---sitekugulekag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=textbook+of+microbiology+by+ananthanarayan+pdf+downloadPDF 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_off0000d81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81E 18416 bytes
SHA-256: cee95981b32cdaded16e310aeeb3c19bc68bf82400c0f2916de53359aece9604
font_01_sfnt_off0001087e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12095 11396 bytes
SHA-256: fc21a9d157da131af0f187410ef90f910c756257916f59dd357c403e95505bdd

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