Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9e1b428f6379c5b…

MALICIOUS

PDF

94.9 KB Created: 2021-06-26 07:19:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 30e88d181869d59c3c15ba0cda21ec8c SHA-1: 8923c74d7b310d4057b6ebfacf75967d7c4888e4 SHA-256: e9e1b428f6379c5bf869afb1b7b63279574fdf7a71055e190be82b5b01f85ff1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple links to external websites, many of which are hosted on compromised CMS uploads, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and link farms points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://infrive.ru/uplcv?utm_term=presentation+on+real+numbers
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4541109c9---voduja.pdf
    • http://studiotecnicopetrillo.eu/userfiles/files/zejaguwa.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/jf99cfi0ricg22p6vh0o72gj7m/60869513957.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/pehtt7oab31rs1f23oofa2mr81/36225775475.pdf
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/b889ac711929acb731bf6373c40d8a09/9135007053.pdf
    • http://www.ecvbrass.ch/user/web/file/munipenopuja.pdf
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/66d3be44be95713687f98a141a321503/zojemideziman.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609f04d847d64---pesegikakexedaxajowaxa.pdf
    • http://alliance-ltd.com/userfiles/28950372395.pdf
    • https://actor-conseil.com/files/file/jukomexarutir.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/tr256v163n4rebfrpa4k3cnvae/22473139324.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160761898c3b4a---jotuwasutugoxaz.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2c3b974f2---bafupoweto.pdf
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/v6f36dcc2158p3bdo4gdd7egt4/91668106815.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b934cab00---16285889468.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/b1776aa5d28592f4ce742d32005d71f1/1099099275.pdf
    • http://rentbucharest.net/images/userfiles/pedugidejevodiximogarimiz.pdf
    • http://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/83963078594.pdf
    • http://kaitosushisb.com/uploads/files/44074732128.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/1b37cbdcf3a5b6fbf32ae3b950aebe49/sadoxafezupower.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/9487611a8f36f8086d2945d4981aaa22/86702127159.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb670d9696---68683069216.pdf
    • http://roocenter.ru/upload/file/80302289799.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160780d84d00f6---sujelu.pdf
    • http://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/51541840274.pdf
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/e01bbdc4065daf4239d89732d888a94e/zonifibo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001103a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1103A 16792 bytes
font_01_sfnt_off0001284c.bin
77c733482a386238d2d30657a6d50f17038c72beeba9c40838e8c06b1871b12e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1284C 17036 bytes
font_02_sfnt_off000154dd.bin
a7bc590aa57fffc3414aa371981a0341a7b9ed88d81781b66b9b4ff88baf91cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x154DD 10508 bytes