Malicious PDF — malware analysis report

Static analysis result for SHA-256 174097e11fbe97a0…

MALICIOUS

PDF

78.5 KB Created: 2021-09-07 19:21:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fc162cf24d75df8f773492d415890df0 SHA-1: 73d677460e587bab0aaa5a4b5c2c856da07f1945 SHA-256: 174097e11fbe97a0105761a29f9f16ccc0a9c573bb1bce97ad4f50acd979b9fc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download a second-stage payload or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://huntic.ru/uplcv?utm_term=plantar+fasciitis+strengthening+exercises+pdf PDF link annotation
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/40a5fb6bc8189b064d0cae1687b00f3d/xuvajumo.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/gakogidilow.pdfIn PDF document text
    • https://sanidom.pl/img/file/30222091002.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a09b082fa2b---13167724683.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6ac45baf1---bapedurorima.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/xotutusinunejupag.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/79511128055.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/bcfadfcc0835ef4068f25e5090a16f59/19620672573.pdfIn PDF document text
    • http://primehorseproperty.com/userfiles/files/setufurokifuj.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/sugifosevorusoxarev.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/a8efd58b45f50cd031669a10454f11b8/sokijupovideli.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/55762716392.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607fec3f4ec8c---numasenototuduwamul.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/pujis.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/dezazavizesetolajisukol.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16098a89272d76---12193021761.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/f98433cc4f6f438b5ab814d6bf1c15e4/kiverepinojevulovaba.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/s53nej2u8ngd49lcmuft8sfupp/5090616051.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/06e2155ca95f0afe59ecd8b84e46f33f/fojilesogukelusajawovot.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/jopapavura.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098dac94708b---bevododosutejaso.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcd2c68ed4e---70494056311.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/14116459183.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160999c424e2bc---fapije.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/nezolugawisiluvefuta.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/74796791702.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_off0000d0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B0 10884 bytes
SHA-256: 1ece86f48a9ceaefbb3f482784ebf8c575a01d896aa867d0d6665334de49a01c
font_01_sfnt_off0000e995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE995 16476 bytes
SHA-256: 925e94bd29239439943ee63d3ff5f370778a6c48ef34596ea3a6b9b6e3789166
font_02_sfnt_off000113bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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