Malicious PDF — malware analysis report

Static analysis result for SHA-256 2258262c4801a74e…

MALICIOUS

PDF

86.4 KB Created: 2021-09-18 12:38:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9425cd1b89bd1841ab88a58f42916c29 SHA-1: 03a18b50f0c71f6685630d9f01317db6e384bdde SHA-256: 2258262c4801a74e54fc2a9d88ccb637b2be832acb7331f34053f73cffce138f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://pointwebhost.com/calisma2/files/uploads/silidizupikawuzosutij.pdf In PDF document text
    • http://violetstudio.in/userfiles/file/67740693892.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/71198906316.pdfIn PDF document text
    • http://nscenter.cn/upload/files/dokipenodowazipu.pdfIn PDF document text
    • https://svltv.in/userfiles/files/pevitodufiwajutidunat.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/20313417064.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/vatikunan.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/zeradebaxajegakawa.pdfIn PDF document text
    • https://apgr.eu/UserFiles/file/pobozizineterowesawojuw.pdfIn PDF document text
    • http://spec-so.ru/sites/default/files/file/62093931904.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1f904dfbc---80200270318.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/78608020591.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/92772455626.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/68132413724.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/69397535224.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/82646493156.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/tesovuwitadino.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613788ba10a19---watagagurul.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/kirovasezipenosutonon.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/93154284492.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/58265283316.pdfIn PDF document text
    • http://ustunongel.com/image/files/lopenexoki.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1613fadcc9399a---wuwukovavizasikoxobaf.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/fogujupobibakuxixi.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356f967ba02---10994811735.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/4d8e892cc696c794ca7ad720718c05f1/87692869860.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=soundiiz+premium+apkPDF 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_off0000ebd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD3 10568 bytes
SHA-256: b88b1af4bae278bbb46edbbd3eb912cebafba6839178d1237e6141fb5350f144
font_01_sfnt_off000103e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E9 18400 bytes
SHA-256: 85ba439dbfdea46c7f43a6d272aa300359ef322560a627c2f6b88776fe1382f2
font_02_sfnt_off000133f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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