Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2e7d1ecdcf538ba…

MALICIOUS

PDF

86.4 KB Created: 2021-09-07 11:15:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 715f0fd2b7f27c3f5adcdbe97068e172 SHA-1: 2039fa2aa836ac6d9c72501646f40034e843cd4b SHA-256: f2e7d1ecdcf538badd899db907fe2977052cc3326ffa2165c855ee08b96e884c
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress sites, indicating an attempt to deliver a malicious payload. The 'Password-protected archive handoff' heuristic suggests the user is prompted to download an encrypted file, likely to evade initial security checks. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://osmed.cz/app/webroot/files/files/robolakoruromodoweg.pdf In PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/10699139288.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/mowupawapipugelopo.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c60d8dafda7---gejodubipopevinetat.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/78624334508.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/e15b6a33b3872af844230bc4019f637f/gejoxatoguxixegudez.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/5f0167a55af7a754d823532e8e2d5bcb/lusilupoteboxatufet.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/domidixusedomajazo.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/sojimatifubopuri.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/lozopedaze.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5f82e894a---39541582520.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac17a40ceca---72353889296.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/rulalif.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/73253603530.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebdc01ddb0---99850118658.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/92045814135.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/00rrr6606h56o6uc7bl89uuu35/bodejoravutovatalojek.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866fd2d2fdf---68902881914.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad18577c820---kerulatipelamagigun.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/57291442135.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/76569795986.pdfIn PDF document text
    • http://davis-wilford.com/clients/5/5d/5d1655677b271656441dfc21bb295863/File/53071454559.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/cd6cb2187c1d39100cfe493661daf100/pejobufozugoxubaripabu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=transformar+em+pdf+imagemPDF 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_off0000e774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE774 20216 bytes
SHA-256: 11be7858b23863db7d88b179112d0c427f6032d9f006b017aefd134246ed7fa0
font_01_sfnt_off00011bc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D7 10660 bytes
SHA-256: c4dd27be3fb1fac6a7041fb5462eec9560d9b120de95d0adc8ccd6185d62a536