Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f494ae73b07cf0d…

MALICIOUS

PDF

70.3 KB Created: 2021-09-12 16:12:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: db785e66251d9b81b3cbdcc1ee0b7af8 SHA-1: 1c1a1d1a2505857d10cc7be1cd3953581410925b SHA-256: 4f494ae73b07cf0d1fa6e4d59b79f70788c751929ae21bce13596a0b8bc3d662
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of multiple PDF links and the nature of the URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/0h581khjauhimkpsjrt01e6f60/13569220093.pdf In PDF document text
    • http://bbfrontedelmare.com/userfiles/files/lojisimiwixogamo.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/60828664221.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/e52830dfef1aa2f758fd63001685075f/jubugukuzezen.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139088437bcb---fowibuvonekimovebobinikir.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0b3123de8---70638735997.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/zovonomunamabokizojopadim.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/11586289264.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/wokivedifakaz.pdfIn PDF document text
    • http://samtle.net/ckupload/files/pupasozazakimer.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/35725569988.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/7de9807cc530c5d1f4cce6849dd3064d/80046750473.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/kulolurugo.pdfIn PDF document text
    • http://mybed.tw/uploads/files/202109121143262633.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338284352cb---pikese.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/v00hi78pkjqgj03uprrc1fk4uo/wisokebugozava.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/xabenuwurolibamosurila.pdfIn PDF document text
    • http://mariancozma.com/_user/file/debemuwigarazajuxubila.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/regozokifebonomabepabixo.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/56687982744.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/gutoreferogozuvobo.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/baloluligulosononuba.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/62896011473.pdfIn PDF document text
    • http://stroi-sistema.ru/img/mumafexedelot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=status+bar+for+android+free+downloadPDF 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_off0000b1e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E2 10748 bytes
SHA-256: 1a6188ff47df717adc9c933ec156476fe1bd2a739b0c3cb67d773fcf1c7bbeee
font_01_sfnt_off0000cac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D5 15964 bytes
SHA-256: 82421aaeb7399c2fe476e783288fcad591a0dcf3b388072e8181b77d97e40479

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