Malicious PDF — malware analysis report

Static analysis result for SHA-256 438f4d9f3b440585…

MALICIOUS

PDF

72.2 KB Created: 2021-09-22 22:01:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e08341788b1f2bfc87b64833f74a0624 SHA-1: 79d204cc9395198206446dfea8f391c5cabcfb77 SHA-256: 438f4d9f3b44058577994a32bf4382aa954463433aa2cc5f773ccadbb0ca47a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised or disposable domains. The primary purpose appears to be directing users to potentially malicious websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://chcial.ru/uplcv?utm_term=best+image+resizer+for+android PDF link annotation
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146fc2729e33---56798662412.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/51366860359.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/52785023471.pdfIn PDF document text
    • https://jxlmedu.com/file/files/20210921_105602.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/gemorez.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/xowaninenuxojitakalujuve.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b4f2d3d493---77771539998.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/56027260595.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/19555848444.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/27199163336.pdfIn PDF document text
    • http://fmdscu.net/userfiles/file/44838833091.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/47371448516.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/56587702963.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/2363238a119293899d1c5d9414a55d82/leramozifetisujezosito.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/favavutavetexojuniz.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352a6a28bfd---wovikijotijapizuxawekazep.pdfIn PDF document text
    • http://erpos.sk/data/files/15681327713.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/542c5ed9a3fe5ba86cf577d99e4b4c12/61044283479.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/2838897214.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/32156761230.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148f48d0b695---jiforeronoxufe.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/gaturabop.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/11314081505.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/41149499771.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/sakuvemitavemexetenonok.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/15951165276.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16132e12f2ba40---jitateleminevafopomesowe.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_off0000ba97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A9 15524 bytes
SHA-256: 4ed7545d22214f61c0abd8f09eec29bbab57600bead9470c8605ac09d524ab56
font_02_sfnt_off0000fa41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA41 10764 bytes
SHA-256: c142e912bf87300d48ab7528d8d5ddbea38653c8457c26f1861b8ce365a1a98a

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