Malicious PDF — malware analysis report

Static analysis result for SHA-256 56675220bd172445…

MALICIOUS

PDF

100.7 KB Created: 2021-08-23 12:19:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c6c0c0e216edf07eb13266349e13bd25 SHA-1: d1263f2d41476c769ed25eb8dc1198267101834c SHA-256: 56675220bd1724454172cb55e4790d1c35f2b34513912451894153637fd27ad9
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites hosted on potentially compromised or disposable domains. These links are likely intended to facilitate phishing attacks or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/6cfa831497c845beb76b58c516c6eda9/36146031989.pdf In PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f39154c0d7---najubira.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/ratekoguwixerewe.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/33436695762.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/53989496072.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/lubabejixuxid.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/jumesoseluzadovimiw.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/50047680724.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1628195787979437223.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/1f3a457895f54867d8f0ad366c0fb137/xutewaj.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/5f439fa1550d966460a47f8abe87386d/sipenozefib.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906f3962734---64592260340.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/dutezupigu.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/38064145993.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/nekidefanixupa.pdfIn PDF document text
    • https://ahha.az/userfiles/file/boxolifavudilef.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/besojakegitiwozu.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/73176446258.pdfIn PDF document text
    • https://gotamsui.com/ck_imgs/files/23614542114.pdfIn PDF document text
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/d9ccd73f9da23dec35bf8d8beb3ed34d/85476069766.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16084e80a2f152---zuwoxorabisekolulu.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/87881947187.pdfIn PDF document text
    • https://deepex.hu/hirek/files/teluf.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/89786510c0c1320a8483126728b30aff/4169998933.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a42fe3f0ab3---25340731546.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=slightly+out+of+reachPDF 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_off000128c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C0 10632 bytes
SHA-256: 8e304f75f9f59905639c1e1fad5017924a8662bc9762db7927e9da272df91698
font_01_sfnt_off0001414a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1414A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001595c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1595C 17016 bytes
SHA-256: 857a0f3940f1c617d1a7c901a687bbe1db6742628f629586ca693631d7bbfe34

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