Malicious PDF — malware analysis report

Static analysis result for SHA-256 a079c9b4e584a7bd…

MALICIOUS

PDF

91.4 KB Created: 2021-06-25 21:36:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 504666b8734d6f6812668d2cca4ae5d5 SHA-1: def1a1e88006fc14843de763824aebc847302a2f SHA-256: a079c9b4e584a7bd9801137779aeed6b5d353971f9cc4babe8fa8f1b3c75d7a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised or disposable domains, suggesting it functions as a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the nature of the URLs and the PDF structure align with common techniques for delivering malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://taechoclub.com/FileData/ckfinder/files/20210612_DE1AC0DEC470F868.pdf In PDF document text
    • http://myucmas.com/userfiles/file/diwojababefan.pdfIn PDF document text
    • https://smilepaper.tw/archive/upload/files/bolamomasibotu.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095917af34a3---bimeselonuzewe.pdfIn PDF document text
    • http://nakatka.com/files/file/21123109597.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/79a77cb5458e16ef9959c53d6ec2e3be/zanafapokaditanu.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/b5456351a257f2d1ce82394ef44ebcab/futuvulosufoz.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/epah397nlmbtpevoaguak8fof4/redad.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/zagumunol.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/xewegap.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608cffaf738ea---83439762815.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a024744ff1---51856646065.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/03d4399e5c5dd2d715a789d378b12e34/sadunepapujulidu.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/gofbu5g308cfrjrjqt2p58ogfk/sagipewesatuvar.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/15316161978.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/384e8f1e20341f397098bc6d8cde8fe3/dixud.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc42e1c7cb---26607661975.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/palexagaxodivelotip.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/aa4484566e45bf19243ca7674c8d8c0f/74123428117.pdfIn PDF document text
    • http://guchenes.com/d/files/63914263659.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16078dab667930---gowamedopawinomi.pdfIn PDF document text
    • http://irishvaughans.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/xupobejekapezuxe.pdfIn PDF document text
    • http://usmleworkout.com/files/file/takexesibifejobebe.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/gizajuxibipe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=stages+of+mitosis+1PDF 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_off00010522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10522 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D34 16716 bytes
SHA-256: 5a8b4c56d533339cdcdeb6f21becb22e5ab0b4bf5f36d294eefe5018a77c15cc
font_02_sfnt_off000148c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148C9 10432 bytes
SHA-256: fac0c508f26cb63dac9ae7872b5429e0bd1049555bea46fae241c82e3ce88f15

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