Malicious PDF — malware analysis report

Static analysis result for SHA-256 1373b6ddcf0a6eb3…

MALICIOUS

PDF

80.3 KB Created: 2021-10-07 12:12:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f4dcb007c2c7c5e5fb4dbe2f0b5f802d SHA-1: d95250a65432f3c59489cd77e2ca51dddbf82cc2 SHA-256: 1373b6ddcf0a6eb31ef5953f030822befda71587ee8d4eb8d7bbff76890954af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs that form a link farm, pointing to various domains, some of which appear to be compromised CMS uploads. The primary purpose seems to be redirecting users to external sites, likely for phishing or to download further malicious content. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • 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://infrive.ru/uplcv?utm_term=federal+powers+definition PDF link annotation
    • http://tasteofruraleurope.eu/upload/File/894432979.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/62165554958.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/2786739293.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/10808872573.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/pivefekuwasurimibexovepi.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/19642290197.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161497d4a1da32---27899724196.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161411daa0d097---71223965282.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/pejilasumuba.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/semadus.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145665fa8a3c---lepiridabirevi.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/suzimusiwidolibukazupen.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/nidotizamomujavadov.pdfIn PDF document text
    • http://hun777.hu/_user/file/34319406437.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/1b1cb0826ef7cc9cdc98353a7761a7cb/1492193465.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1615dc2cb24a20---88853244634.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/75975393759.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/42687763646.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136abe98b2e9---ragiwarupukalikeweg.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/budupebotovadubex.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/44910345840.pdfIn PDF document text
    • https://rt9.rspo.org/ckfinder/userfiles/files/zorowogoredikiwuru.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_off0000d2c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C7 10556 bytes
SHA-256: 20c37d311b27c14284bc6d5280db2c7c1eb62db7f4a8aaafdd2089ce22884b71
font_01_sfnt_off0000eb00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB00 18720 bytes
SHA-256: b62b794c688f9f9e4a71025d20e02b89cb37ac7a2406b9c488a6023404d78b8c
font_02_sfnt_off00011c19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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