Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7151f464f811f25…

MALICIOUS

PDF

87.6 KB Created: 2021-09-12 10:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c3ad5c8e13cbbf58d431e8096c103d4f SHA-1: f13043c2aa761b02d5c694344ddf9066d68e4fea SHA-256: b7151f464f811f258238cc74e6691b7b11f32c64e74a47c0afea24bce76353c3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final destination or distribute payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://findmecakes.com/userfiles/files/12276481221.pdf In PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/983c01c29197f509af12f238d8a17df2/17339362922.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/kanutosulodejito.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/teletilonim.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/xomake.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/sevegof.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/rudetipiwixa.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/wudukasafu.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/japujisajas.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/lidosanisibigaliwubanod.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/pazenekizija.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/kajuletujitel.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613270d8a741e---lewojoreruf.pdfIn PDF document text
    • https://asken.as/bilder/file/foxawudozipegil.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/41495955424.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/fipimajiw.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/90923056941.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/68810769634.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/qupl6beip5akjm2jdkbmnhifb5/zumaxa.pdfIn PDF document text
    • http://proxima-design.cz/files/file/26410315969.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/mgjpq15l4912372446af207if5/soviwojipupiwomujaforobo.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613491aec6c43---biruvexexataxubifexop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=the+peripheral+nervous+system+is+divided+into+two+partsPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E0 10988 bytes
SHA-256: 82575e675b5cb8157cf0e4600b18da303ae4923aa50e626e3cd870990d46c24e
font_01_sfnt_off00010a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A40 18096 bytes
SHA-256: 4e3220fc10b5862270cc2addd9c5c3a183b20869a0459ef6c23d896c02280d68
font_02_sfnt_off0001389d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1389D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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