Malicious PDF — malware analysis report

Static analysis result for SHA-256 424a93df73ba14dc…

MALICIOUS

PDF

72.9 KB Created: 2021-09-05 16:26:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 599c4b9d941b176e4cf10cda268140db SHA-1: c66566e05bd1ec3b13438995adf27e0079ed492c SHA-256: 424a93df73ba14dcc332bf123e74e362de8f48a27368fbff807d5ef99ae1b33d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress sites and disposable hosting. These links likely serve as a distribution mechanism for phishing or malware, aligning with the Spearphishing Attachment technique. No scripts were extracted, but the presence of numerous external links suggests a redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://chcial.ru/uplcv?utm_term=el+cientifico+y+el+politico+max+weber+pdf PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6ebc63512c---wegatusipamujanolubi.pdfIn PDF document text
    • http://www.trafikyaren.com/wp-content/plugins/super-forms/uploads/php/files/4bf4tjm5ic0cfvtk7mpfo41721/rusebizolon.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/99e31cfdccc373f211af3ec3d2dbf0b8/lixarokij.pdfIn PDF document text
    • http://newo.ru/files/files/ledajebamifisarirexowimi.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/87196205971.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/1298666844c5cf62d6ae631ad02f6f14/guvositenezupesorireka.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/aos6h7r77uojndl5kml2md4652/61323210010.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/zemalokexemifakapenuzi.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f4084cc1a---rosogewirujakileguxupe.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/92797286473.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/67221173358.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/9129aeb510d1b00b441d5f94285e9b1b/64607357610.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/9294417213.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a52c74d5e4---dojevowukerejudoxetuxe.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/jobegurupokojusaniwoxo.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210806_054050.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/l6a78v8rb19f5dlm1jkfto8eab/rudapamazakur.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/jabusegubagowutele.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7538c48603---67008131425.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/22714312763.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/oep036vshe3dtto6u49gj142nb/zinologuxoripubimawaguzi.pdfIn PDF document text
    • http://ohstigers66.com/clients/d/da/da15611725e7ba20b6827cbf2e24f87d/File/napiranimunu.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/bec26a4df56516241818736926d5fa60/savitopavedixuvixam.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f4e5c6e65---nitijanotaluseno.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/vutabufibuzapov.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_off0000bbe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F8 11040 bytes
SHA-256: 2f7552bd662f769a0122eb4a7bd4a9eaa248a9d72aa1fbf0b14143a2ea67b1a4
font_02_sfnt_off0000ed75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED75 16116 bytes
SHA-256: 7b2f1f078d8e09b66a03dd0e1f43269c4a0ce2e652c3a8dd0b23e7bbd9d95eb5

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