Malicious PDF — malware analysis report

Static analysis result for SHA-256 660e72c35d458346…

MALICIOUS

PDF

74.5 KB Created: 2021-09-05 12:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 79c977afcbc8a1b35a792d3553d78530 SHA-1: 926fe1022399aa3a16519e30b947b01d41b0d802 SHA-256: 660e72c35d4583460f0f7bc77ce12b0971916923dbf6f0de1fdf3e517eafdafd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the structure suggests the PDF is designed to lure users into clicking these links, which in turn lead to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608b62ec3c9aa---76267919179.pdf In PDF document text
    • https://southafricapools.com/contents//files/19650308524.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/5a3ec4ef7008cf6e958b94f0068b9b30/wumelafovimozanumo.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/boretabumuzuladerewenifos.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/8e71adf4812a25969b47dd2115e69440/xuvezujipijuxixakubimaxu.pdfIn PDF document text
    • https://songhong.info/userfiles/file/9717835261.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/e411f19de964a7878187d6df39304b4e/widatunetipuwapim.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/32940064934.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/25617855088.pdfIn PDF document text
    • http://zxsolar.com/d/files/41443573486.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608b046161b2e---bigiva.pdfIn PDF document text
    • http://chromavials.com/d/files/siwuwikakegevupesorazosel.pdfIn PDF document text
    • http://cbwmd.com/uploads/Files/vimowudipun.pdfIn PDF document text
    • http://xn--kprq5pvqklteonubj6c.tw/CKEdit/upload/files/49113694095.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/kujoriresujosuweg.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0393065001620184294.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/64v7ssae143c5tob99ofs4rc05/soditoturuboviwifijajaj.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/062112459884.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160ab96d57631f---ronugifuliwejole.pdfIn PDF document text
    • http://attlas.center/userfiles/file/nitizojonesatot.pdfIn PDF document text
    • http://xtra360.net/campannas/file/96513921859.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/11188432192.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=hedonismo+psicol%C3%B3gico+pdfPDF 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_off0000bda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B7 17640 bytes
SHA-256: e002db532b28e8e2041eb2a542c4ed5b6809f780a3a12348c403c644d6f3b7f7
font_02_sfnt_off0001026b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026B 10732 bytes
SHA-256: 11f235367735e6eb3255f7933b418d48ceaf5ddae3f37c21e65b582c06e8aa0c

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