Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc3a2b24d361a30e…

MALICIOUS

PDF

78.2 KB Created: 2021-09-17 15:54:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 177a4e1a9dfbb0cbd964cfd4f2fa82db SHA-1: 1fb98738b3527c48bea8fde0c90c08b6320bda71 SHA-256: cc3a2b24d361a30e02272881b7d3223d2ea477fb44d163de32247480c9a5c878
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to various domains, some of which are hosted on compromised WordPress sites, suggesting an attempt to obscure the final destination or leverage trusted domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cuacuontoanthang.com/media/file/15980119401.pdf In PDF document text
    • https://ecotranslation.ca/upload/editor/file/xukepita.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/24156739323.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136c75e5899d---43542468720.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350626cd3ea---wopan.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/buzowabimuwim.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/27156913550.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/timusurirebod.pdfIn PDF document text
    • http://hongpakthai.com/ckfinder/userfiles/files/45544637120.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/kudulunolaxa.pdfIn PDF document text
    • https://riolisboa.com/images/ul_files/file/GVxcdY2nI5Pt.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/43cd84183551ddc6f2623187f9aadf1c/44879464536.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/pelike.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/xuvulejozoziwuxezax.pdfIn PDF document text
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/86349925124.pdfIn PDF document text
    • http://373113.linker.tw/files/zofipazafiwi.pdfIn PDF document text
    • http://tieclangman.com/Images_upload/files/38138541604.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/44010983688.pdfIn PDF document text
    • https://xn--atpta-nfb.lv/images/userfiles/files/37380294098.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/30929978108.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/lugiramefosedigulul.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/3se7vsi49veohr9b6ujuiceaa0/nevupajadisoru.pdfIn PDF document text
    • http://punaide.com/userfiles/files/fuzebafuxitesogomiri.pdfIn PDF document text
    • https://allianztc.ro/files/file/65490252588.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=asus+memo+pad+7+lte+unlockPDF 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_off0000cb82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB82 18076 bytes
SHA-256: 9c4e68551bb8361c5828ecc8336677885d6c21a6e083f4fbd9c90713dfe7d04d
font_01_sfnt_off0000fa90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA90 10704 bytes
SHA-256: 0ac1c1a8b120cc66cfa7ace01e523ec7f42371ea696f073fd0a6f7fdb3c246aa
font_02_sfnt_off00011344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11344 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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