Malicious PDF — malware analysis report

Static analysis result for SHA-256 f533d8ca9ad7c563…

MALICIOUS

PDF

69.8 KB Created: 2021-09-29 13:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 32f6e0f5f5982a95164bcecd24d0ae72 SHA-1: 8d0abdd77906d7b865e44379013c39e2881f5ce0 SHA-256: f533d8ca9ad7c5635bae6c780019e238b8ad9fbe5c70410e151739068b2200d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically indicating phishing and trojan activity. It contains numerous embedded URLs pointing to compromised WordPress sites and other domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://cructi.ru/uplcv?utm_term=stonebwoy+new+song PDF link annotation
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614934edcaf64---6246616365.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/34772551424.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/nupotegobuwalomerova.pdfIn PDF document text
    • https://halkum.rs/files/bukofilupudapepukib.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615307569cad8---58839756925.pdfIn PDF document text
    • http://dasbluemchen.com/64301682699.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/60102822988.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/161503164dfcb1---risovuwebobirumevewipij.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161349f7dedf58---mirefenupifejikupomumi.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/doruzodisilovoturewonokag.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/zigemesenotipozi.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/wazojazagasexisixetitonaz.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/posajikuvedepidiwotak.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/nedajeziv.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9add903a8---16924765921.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/sazevedonajunobajivo.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/bivowafomaludotuvedujili.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/87469369283.pdfIn PDF document text
    • http://squash-fitness.cz/userfiles/file/27413246293.pdfIn PDF document text
    • https://reha.bg/content/upload/file/80654692696.pdfIn PDF document text
    • http://novafish.it/userfiles/files/28456903634.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/movuwajuxor.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/ivukasuj.pdfIn PDF document text
    • https://sadex.pl/fck/file/kisuso.pdfIn PDF document text
    • https://ises.smithpressautomation.com/phpsites/vertical_living/uploads/file/86154467881.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/40859339564.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_off0000b2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2AE 10300 bytes
SHA-256: aba542bd7c254b9c1671f95dc54b85f50b47b4f716f5b51d411bbac2442c55d9
font_01_sfnt_off0000ca1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1D 15488 bytes
SHA-256: 6a4036c9732d0d6d78d58346699163f16a061eb4dd02f7b1d67050b6b6dc57f2
font_02_sfnt_off0000f186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF186 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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