Malicious PDF — malware analysis report

Static analysis result for SHA-256 8573ba1b47609182…

MALICIOUS

PDF

75.6 KB Created: 2021-09-07 07:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: a0b4ec0e8d74cb9ee6d06292a1daccee SHA-1: 65a7cf27e858a66663ddb435e2c5f30048ca7d1b SHA-256: 8573ba1b476091827850e62d15f84f91c721f0143dbb29b565211f52a6fbdeea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The file's structure and the presence of numerous external links strongly indicate a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://ketchas.ru/uplcv?utm_term=importancia+de+los+factores+bioticos+y+abioticos+pdf PDF link annotation
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/b71b3a862f450076e9a0ab549124cda9/10328368910.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/a06944c1fb51e2f3952b2957c1d23ed2/60921914747.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/0dd0dbdc79dc08537c32448b6e96033f/fumovurirap.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/7017971a72c8c791a246ac34980f10dd/57919194129.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d13ca5e6d---60820452083.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d91304a1f3f---wulal.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c067297ea3f---mopoxapedozobemimefumata.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/conn4adio07kra76beto49s7r4/87172407848.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a46c7975e---30284931327.pdfIn PDF document text
    • https://sbufficio.it/file/73470576888.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/2119999432.pdfIn PDF document text
    • http://woykoff.hu/upload/file/xodagekiwunezipodesi.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/subite.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/22342696722.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/7074331108.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/muxajuzewofekuke.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5cc9b41206---zawatakuzek.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/97994429097.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/94824804974.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/1383eaf159325273bf63015af6fbe36a/73339760530.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a4f1fb5b39---64936627710.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210817102735167.pdfIn PDF document text
    • http://maryamghiasi.com/images/upload/files/metudasirakadofobudala.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109fb10578c8---88527207780.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_off0000c409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC409 10984 bytes
SHA-256: 53f818fb1b49741256ad609877c688de5ffe3305f9c2750bf091f229b8ee2077
font_01_sfnt_off0000dd51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF563 17344 bytes
SHA-256: 5652b138782adc688d92b55c29b8d4f8f14d3c78a278dd0f79a79e1b7e8bdcba

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