Malicious PDF — malware analysis report

Static analysis result for SHA-256 35b97327119ed45f…

MALICIOUS

PDF

79.2 KB Created: 2021-09-13 16:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e8e8c5328249a924b1e92b61cff3157a SHA-1: 16ab7057eab309f88a6b7de14587af889a6eacfd SHA-256: 35b97327119ed45f5a521e26831b525b41adf04e47b7a0d2bdb767233cea55c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to various domains, many of which appear to be compromised CMS uploads or disposable hosting. The primary purpose seems to be directing users to potentially malicious content or phishing sites, indicated by the numerous external URIs and the 'link farm' heuristic. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cructi.ru/uplcv?utm_term=dig+tycoon+idle+game+mod+apk PDF link annotation
    • http://www.optimizecost.com/admin/ficheros_fckedit_subidos/lusuporekumu.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/5090489526.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/4517247110.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8e138c1d5---ruxivoxudiboj.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/sebip.pdfIn PDF document text
    • https://labelmarket.pl/data/file/mepemi.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/21809449744.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109041931069541.pdfIn PDF document text
    • https://successalpha.team/upload/files/61483905552.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/49974352224.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/53198299427.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/musesivixaloxelasig.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/31434976356.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/xexexizebedopi.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcdaf3f878---topedizorufikokoloj.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/nakujusudusamet.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/xeziza.pdfIn PDF document text
    • https://onthespothousing.com/userfiles/file/jilumagajojekugimegosa.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/77620563579.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/pokexilevut.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/medadekijokerepujubuna.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b540ec8000---jakuvatidi.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f531fd8949---mopejidetudosiku.pdfIn PDF document text
    • https://euforbiabulgaria.gbinvest.net/uploads/pages/files/kewobefefenit.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/nefovofumefatug.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_off0000cc46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC46 19284 bytes
SHA-256: ae03c8dc7d2ba97ffa027e702a267fef1bb3633aa58f97f1444c522777442e1e
font_01_sfnt_off0000fe34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE34 10796 bytes
SHA-256: 88937293133d57c66be1c97934d55d4a656fc2a1b4ac8e2d85b4435a50651289
font_02_sfnt_off000116e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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