Malicious PDF — malware analysis report

Static analysis result for SHA-256 adb477c8bed6ac47…

MALICIOUS

PDF

78.9 KB Created: 2021-09-06 20:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 019ab8e33aa720c650a565a4fd04a542 SHA-1: 5201971e15cd070af2776b21949d6b7a2310d871 SHA-256: adb477c8bed6ac47f2321544ef103e67ee6e7601fcb816f93f7d850ad963fa92
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • 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://archism.ru/uplcv?utm_term=concept+of+political+development+pdf PDF link annotation
    • http://anhuicrew.com/upload_fck/file/2021-5-21/20210521070120281818.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/30mhfd4kc25tqo8n7o09a0vqh6/bigibepokovinojol.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/vozemekiwuz.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///bipofufada.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/xotexoxufejovu.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/tuxuzizumegofuworokagedet.pdfIn PDF document text
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/81600543258.pdfIn PDF document text
    • http://jkohut.pl/file/ronetekejoluvobobazelaxiv.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb3ee4b582---40391778753.pdfIn PDF document text
    • http://amandamaitland.com/images/file/zasuzeravi.pdfIn PDF document text
    • http://tselectromechanical.com/uploads/CKfiles/files/pumanivafevebisimetigep.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/gctp5ifn07282bfci6s0q1jkeh/78345730407.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/d791aa48ef22da3cce00d11b70472697/rowobiditusizug.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a1c20fd98---24928743594.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/mipivofimonuzowelejanu.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-7/20210507062314791764.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf549b7b092---32914443919.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/57107442765.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/957a75e3a168fc2a0309492d978f131f/gisajifipagutevujes.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a42ff17f8---98205184069.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710c8a71588---zuwuw.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/22742627057.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/6377946162.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/404bd3d4913a5689ce319808b7a9b421/xexoworotuzekunagon.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_off0000cf24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73B 10612 bytes
SHA-256: 1920e814c6b2cd540328c1c16486eab10421b531a660197bcccc98b19f36126b
font_02_sfnt_off0000ff77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF77 18228 bytes
SHA-256: 2682b5e77507ef668ccd532a50e75a0d3dcf6b1ed1a1b3c32644160a9035670a

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