Malicious PDF — malware analysis report

Static analysis result for SHA-256 821b01699e9536df…

MALICIOUS

PDF

84.2 KB Created: 2021-09-21 15:15:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d34867781488a7ff2e7e73f12a7be093 SHA-1: 196b68046fb8100267b385e1bffe9a6bea540dee SHA-256: 821b01699e9536df846e13aeb1b93aa5387f6e648ae5566710bf1252e0b6fc63
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely provides instructions to decrypt a password-protected archive, a common tactic to bypass security filters. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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.
  • 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://oniceh.ru/uplcv?utm_term=how+to+disable+gps+on+android+phone PDF link annotation
    • http://bluelakehomestay.com/uploads/image/files/wizepetanis.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/nonab.pdfIn PDF document text
    • https://shidoremicrosys.com/media/89029293749.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/37571349651.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/bolitesebikulilumigilen.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/nibodi.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/mumuxomimomov.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161314a495aeba---83832346600.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/wigudezuzafepefu.pdfIn PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/55954848225.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/96900233694.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161330c7434d59---18785981306.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/meganolexoki.pdfIn PDF document text
    • http://otczenacts.com/media/files/74105790958.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/nabinavadimutavajixuv.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/50876974431.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e12b7c794---tixivanune.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/94299102510.pdfIn PDF document text
    • https://tranthachcaodanang.thicongmaiche.com/uploads/image/files/bilibuvuganukexa.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/xijewoj.pdfIn PDF document text
    • http://orzo.cz/uploaded/files/18241398920.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/soxelifij.pdfIn PDF document text
    • http://eventechsite.com/files/files/vesunulavoziwesonoki.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_off0000e349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE349 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5B 17916 bytes
SHA-256: 26f652626a1dbeecbca9dffc68f7390a6a852fcce0d916c28a4c4fe6613782f8
font_02_sfnt_off00012a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A57 10888 bytes
SHA-256: 020cc4a0edad6b0ebf3dbf0045c9774aa7dc22f05ea1d25dc40fc34622f4511f

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