Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3e81b078b3fe63d…

MALICIOUS

PDF

105.4 KB Created: 2021-09-07 06:29:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 497ae9a2e168cf88724c478d12adea36 SHA-1: 975586bfbd8bf672a0695f226c7a7e4344c6c8e7 SHA-256: f3e81b078b3fe63d2092ba1757e2282d674866273c0fcac7397cbbcc5fa59dfd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The file also functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. These links likely lead to phishing pages or further malware downloads, as indicated by the ClamAV detection and ML classifier.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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 http://laureysnv.be/uploads/files/fekux.pdf In PDF document text
    • http://thepokewave.com/uploads/files/62546702641.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/geninuzewejiwavobafim.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/29c4ba6159978a1ed6706cb553cd9c27/99819515542.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/fatixasivewusigamarajis.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/xanivaloxa.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/11477825797.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/h400t4rhh79hffbbi30t0eitjp/98164397351.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/fe72f22a88faabc10e97bdcef2c67af3/vipowabosaxe.pdfIn PDF document text
    • http://stevis.cz/files/file/28418626802.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/tizenupuwabuwet.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/tgpj0osq0iqq1d0pgp78thgu1s/mizejapukimiwef.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/nifeki.pdfIn PDF document text
    • http://belv.ru/userfiles/file/sefigixa.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/9915314296.pdfIn PDF document text
    • http://samromschool.com/UserFiles/file/gosoka.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/xunilifumoretawuguw.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/5660c4127117a9b9b32eabdbf111f4dd/70366672865.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609da3045396a---lewokirol.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/bununilojupo.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/tisiruvub.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/kawaza.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/9091034671.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cce636660c---3762611413.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ada68c558a1---30870407392.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/76f237a3812b15c2babea6ee09fdbb71/nofiwal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=bantu+migration+theories+pdfPDF 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_off00013382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13382 19444 bytes
SHA-256: 58d5315f6e494a40fe3a7f02cce28adbac2d2205c1e5c5cbad7507da890785e9
font_01_sfnt_off00016601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16601 11052 bytes
SHA-256: 5587254cd2d1fe14ff20468f0e8886873c12fc44d51b25efeb1970460b36107d
font_02_sfnt_off00017f59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1