Malicious PDF — malware analysis report

Static analysis result for SHA-256 646371e537eb11d1…

MALICIOUS

PDF

80.2 KB Created: 2021-09-05 10:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 784eebb7234b272a8deff4a0a9543cf6 SHA-1: 9dd0274eecae2f32e1e46a32988962b7ec20896b SHA-256: 646371e537eb11d19435c83504d2c9daa6d01ed67dad37f9faabfb367d7d5d67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing a large number of links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or redirection to malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users into clicking malicious links, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160dd6195d1614---72701289338.pdf In PDF document text
    • http://campbellelectronics.com/uploads/99549487052.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/4612136ec4d65573ed03a5967359a6c9/50350792105.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b35a473db---delakifafiladomaw.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/60978966679.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/5fvecn5td167ouc392hknspve0/bexar.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/97401249776.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/899c506bf0f728fe5a5a39cdacb983cf/85735647921.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/1626986489a468d3aeeda0593ba90b.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dd37f0c93dc8c3bb5c431c3e39b2cc9a/jokivaralomunuzenaga.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/f0eoorok1juajt2tebco855p98/78227506324.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16084d3166422f---88214647141.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/7d9fe9bca6ca940c0e88f36d4e3ec3d4/80270398821.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/lavoresigakivusutakozimi.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/30100994044.pdfIn PDF document text
    • http://fuga-hotel.com/CKEdit/upload/files/xejizelafejun.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/tofowik.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/39950146897.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/57b7168c30629c0e2fd2fe1a56117479/xusururidufudatotenul.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/relutojetemuzapoguta.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/2vdqis9kvrgjf78m3log0ukc54/91939196509.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/54617830166.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/wejaboranereforanaxen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=protocolo+ntp+pdfPDF 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_off0000d5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CD 18072 bytes
SHA-256: a7910491bd5a96bd8966e27108899a4e9f83b723b9735a04b933223c389ec95c
font_01_sfnt_off0001053a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053A 10060 bytes
SHA-256: 97d33734575d3781716f6d8bbf2c227e147c5d724a9949745628621292f786b1
font_02_sfnt_off00011bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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