Malicious PDF — malware analysis report

Static analysis result for SHA-256 817ae9b4f165d3b3…

MALICIOUS

PDF

88.0 KB Created: 2021-09-02 06:55:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d51b0324ae9ab289920df8bd82bce64e SHA-1: cdb52434d2cf0117c0f8bfe33fed467367f36048 SHA-256: 817ae9b4f165d3b3b157bdf61cd07df157e909ac9e4fd464b3d123ccb42cba60
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features numerous external links, many pointing to compromised CMS uploads, suggesting an attempt to lure users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/304af5e0b4ba69da4128b7a395d0618a/72325802859.pdf In PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/3ec5ba4ae89d99da359eb779b80f46e9/33788140882.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b151b32219---50050960484.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/94582175453.pdfIn PDF document text
    • http://clingac.es/d/files/vesotedenevej.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/cc0ab6cf93d64a89dc592f3019d3a88a/setufaxiruwoweladosas.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/jipeverexilekaxumigux.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089462482c05---29194048458.pdfIn PDF document text
    • http://preserveproperties.com/userfiles/files/mipenatamuku.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/mfklmkv8m72jjtm5omt5o00es0/95043140324.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/derulelonubi.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/37007450476.pdfIn PDF document text
    • http://absigorta.come/file/24675159152.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/mebes.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/dotulojofudir.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/f11364f5813442304a3015d8337de8d0/56448411024.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16098f2cb57918---47407498855.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/281707596575.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/6e3789497981bbeb2875257f8cf50e50/15679357147.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/33284097735.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/7508001017.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/8709ffbb14244851e0899e28c1741a1c/xulozujom.pdfIn PDF document text
    • http://web68s.com/upload/files/xemilefenafidezigubulen.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/kakikokisegube.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/ferakilegafigalabevapuk.pdfIn PDF document text
    • http://rhodeislandalpha.com/clients/56223/File/63888190217.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a033fa2155b---8567716549.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=highest+grossing+movies+of+2018PDF 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_off0000ec85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC85 19500 bytes
SHA-256: 07e357df9efea3f2418c3403a08b61190f4aa3d01cc7fbb78ae9761d71061dd9
font_01_sfnt_off00011fc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC8 11012 bytes
SHA-256: 35df8b235aee23b5073c9a91f35aa49a9dee5b05715835d3f5c6ea60c2bbac2b
font_02_sfnt_off00013944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13944 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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