Malicious PDF — malware analysis report

Static analysis result for SHA-256 50b53f0815313875…

MALICIOUS

PDF

79.7 KB Created: 2021-07-29 17:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d7d185734c2d8c3c6580960aeac77dec SHA-1: 3f424de94f44fd2694eec6a12e153d3514f27ca3 SHA-256: 50b53f08153138754e2a8f81caa6d37dd72e7f8a780449273148548e4a3c652a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites, potentially for exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • 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.
  • 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://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/fab9be42ede3cc2c5934391d6b561b72/62919780108.pdf In PDF document text
    • http://busankid.com/webfiles/board/file///fiwivix.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/divodozifegedula.pdfIn PDF document text
    • https://samowar.ch/upload/file/17808202653.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160856e683baa3---8584902892.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/a57241b4e4555940993da1c2429c4ae8/genosifafofakod.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/24454673990.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/345b423ba09d25aaea7c296d861199fb/97201700031.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/28599341260.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/10730072374.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d4bbbe826---tarusofovodovebipudureta.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084aa6c45c36---35824103301.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/remugofiwino.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c771958e8fe---89087144714.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/65857835749.pdfIn PDF document text
    • https://immobiliaresancarlotrieste.it/file/22444341551.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/a99ff291623ee7c256eab05d9ce8086f/17144017684.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/momeduvorolot.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c98b0b27ad2---pigalokex.pdfIn PDF document text
    • http://hillcresthigh1971.com/clients/9/9f/9fbf9047a6869172a982db6f42f05a9a/File/suzuvigififejasapexef.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/vasawobemudiwigi.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/70838814894.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081affabd537---kakawapuba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=volume+of+triangular+prism+worksheet+answersPDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/38297850156.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_off0000d268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD268 16788 bytes
SHA-256: d1de2ec48dc8eaf9b78d85f8370ffba9342f9de5b664caab026e47aff868de0a
font_01_sfnt_off0000fe05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE05 11052 bytes
SHA-256: ac646f4f57b69d86657c348ed6b4604f273bffbcdf22e01ceb56619fd867b07e
font_02_sfnt_off000117a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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