Malicious PDF — malware analysis report

Static analysis result for SHA-256 80d70a5c65f5e6ea…

MALICIOUS

PDF

87.6 KB Created: 2021-07-26 04:13:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 90e67bff4c19a090d3418be5a14d62a7 SHA-1: 48acc856b0d12f90a4d16ff0c7051313953431ad SHA-256: 80d70a5c65f5e6ea404ce1f4defca3d0ae08091b7b715a3464b3d795542e0371
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF document that contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate maliciousness. The document's structure suggests it functions as a link farm, likely intended to direct users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/dc6997d21ec4978262f7661eacfe4dd1/ruvadodipidodonawad.pdf In PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/d53284fe79c70d2f69bf828301b2da9f/20809705941.pdfIn PDF document text
    • http://lemfhafamilylove.com/clients/a/ae/ae548a02e38cf20d1222216853584fb4/File/31242469032.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/somadipanemoxopokarux.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/223af0c22f8e19b8c6fd424669389bf1/70348602433.pdfIn PDF document text
    • http://cmtsport.com/pliki/12659718585.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1608db0b9b9fd2---pijon.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/viwewitasufata.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b99c87083a5---gobemozodukarogu.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/reparotigusufidukalope.pdfIn PDF document text
    • http://championsview.net/userimages/61066477482.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6c47a4fa0---28781403682.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/31154873823.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/vigipipagu.pdfIn PDF document text
    • http://michelschuurmans.nl/images/uploads/file/fokonisagupefesujojap.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1606f380d65759---46118301242.pdfIn PDF document text
    • http://diamondsnspurs.com/clients/12200/File/sizosura.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b73049844---20493373617.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbfb43d673---tovunofawoxijolerinoxaxe.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/79989849003.pdfIn PDF document text
    • http://isystem.hu/ckfinder/userfiles/files/busomepaxepat.pdfIn PDF document text
    • http://landpas.pl/upload/file/36844874657.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/17058672464.pdfIn PDF document text
    • http://cuacongtrinh.vn/upload/files/jonujajijeval.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=prison+break+season+3+subtitles+free+downloadPDF 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_off0000f5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CB 10936 bytes
SHA-256: db25a2c33aa11e49c7d8bf49dcdeb067a07d0258f8255bddcf057f97b7c120ca
font_01_sfnt_off00010f55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12767 15872 bytes
SHA-256: 81857087072a967e9f3d55b6b437931bf941191f95cd67cd45ee7792067860bc