Malicious PDF — malware analysis report

Static analysis result for SHA-256 11779f2ec2140e7e…

MALICIOUS

PDF

91.3 KB Created: 2021-09-19 01:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4197f35270a8a72595cb6475a9049167 SHA-1: 049de163577f4df30512703bfa76a7ef50133dd2 SHA-256: 11779f2ec2140e7e33e3161486dc0de9c772884dbbe789b4cbf3a19ccb1d7a3d
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple external URI heuristics confirms the intent to lead users to external, potentially harmful, content. No scripts were extracted, but the link farm itself is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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://irlanc.ru/uplcv?utm_term=exp+cheat+platinum PDF link annotation
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/89398102883.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136a22651598---21123473654.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613e14bbd68df---42446138032.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/duxarunatanozuduj.pdfIn PDF document text
    • http://liluby.com/upload/file/zabafakegujo.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/80852647891.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac9a0efbd2---74745071716.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210904044319.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/lorobobironujatamemuno.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/8f50d38dac399fd457aac30d195c319e/50312905862.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/a2ea4d1ba79cb3ff54f47ec0edd1a20b/wexemapizugigupamub.pdfIn PDF document text
    • https://purefeeling8.com/data/file/jopuleralivigufosabow.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/3p07mfhsl33dmolnv5n1akmb78/25900174517.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/8024c8fa88bf338bc8ec2505d8f0fcdd/35688130827.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/30193468250.pdfIn PDF document text
    • http://schturman.ru/files/files/fifiwegime.pdfIn PDF document text
    • https://la-klamm.org/Files/files/falokupik.pdfIn PDF document text
    • http://canvangdientu.com/images/file/18909184275.pdfIn PDF document text
    • https://istanajp.com/contents/files/bivelikobototu.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/78922144523.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/babebiwuwatarinarakogixop.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/vibonenevigapijarubav.pdfIn PDF document text
    • https://jobtiara.com/files/files/36186322278.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_off0001033e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033E 17424 bytes
SHA-256: 3fe0b9010bd520477b15434db49672bf564bb3317bfdf212c29586b954538761
font_01_sfnt_off00013062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13062 10436 bytes
SHA-256: bd1b68ba60c65db55e918d8f594a16df0d6ea17038b96c7c002f2e26af99b0cd
font_02_sfnt_off000147d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1