Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bd6e9ae4d01744e…

MALICIOUS

PDF

73.1 KB Created: 2021-09-03 22:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dc96cd07c1db5b9e485b809fe4425243 SHA-1: 49d6bbe8dbf7e61ff51ccdf64c3aae2fe1eb6626 SHA-256: 6bd6e9ae4d01744e87ca6c7e1fd1aa6d196637113dd9663603fa9234d111cfc7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to various websites, including those hosted on compromised WordPress installations. The presence of a 'download button' lure suggests an attempt to trick users into clicking these links, potentially leading to further exploitation or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/uplcv?utm_term=mentors+kerala+teaching+manual+std+4 PDF link annotation
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b8dcb70b20a---67912601002.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-13/20210513055436899785.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/50440302034.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/katasazonesib.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/tegosobuzefivavatawasiru.pdfIn PDF document text
    • http://workontext.ru/media/file/woziwonix.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/6afe38d34cccb72152ed093bb0ab9e13/tavujujudizuzerazedumifa.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/40ab6b8a79a3068227f7ca5119f77dd6/wekinemafejewevafa.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/kenozuwezofifuronovipel.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc90df3037---zexubuvogomewone.pdfIn PDF document text
    • http://enerjipiyasalarizirvesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de996ede41b---74075844197.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608037bc630b5---84145654403.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/puridojojolomobepoj.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/nenubig.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/sarikegatave.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/19a066bf52f85c1571e56aff39da2a69/sexisunilonajuxu.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/bda0a9bbb6851ed0cfd3f8a4b68642c6/83374513695.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/40067417415.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160e194cf1e7fa---bawepafunerakenodajotan.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607425d4c539f---lejobozotitezinigodo.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/nazadafopum.pdfIn PDF document text
    • https://amblamy.ee/upload/file/duzuvadigere.pdfIn PDF document text
    • 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_off0000b737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB737 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4E 11080 bytes
SHA-256: 72bd5c65d4d58606dab957bf2967e5ae5e3496a8acc9f293009bc87fc275033d
font_02_sfnt_off0000e8cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CB 17872 bytes
SHA-256: 4b894ad2e6b662379894c17eeee7a655109f2caff449c721034234ae21fbc2bc

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